This experiment was aimed to investigate the effects of mulberry leaf extract on growth performance, slaughter performance and meat quality of yellow dwarf chickens. Three hundred 21-day-old yellow dwarf chickens with the similar initial body weight were randomly divided into four groups with five replicates per group and 15 birds per replicate. Chickens in four groups were fed a basal diet (group Ⅰ, as control group), the basal diet supplemented with 0.2% mulberry leaf extract (group Ⅱ), the basal diet supplemented with 0.5% mulberry leaf extract (group Ⅲ) and the basal diet supplemented with 0.8% mulberry leaf extract (group Ⅳ), respectively. The experiment lasted for 53 days. The results showed as follows:1) compared with the control group, diet supplemented with 0.2%, 0.5% and 0.8% mulberry extract could significantly increase the average daily gain (ADG) and average daily feed intake (ADFI) (P<0.05), and had a decreasing tend in feed/gain, but no significant difference was observed (P>0.05). 2) Compared with the control group, diet supplemented with mulberry extract had no significant differences in slaughter performance (P>0.05), but tended to increase the dressing percentage and half eviscerated yield percentage. 3) With the increase of mulberry leaf extract supplemental level, the values of lightness (L^*), redness (a^*) and yellowness (b^*) of breast muscle and leg muscle showed an increase trend. The pH_{24 h} of breast muscle and leg muscle in supplemented with mulberry leaf extract groups were significantly higher than that in control group (P<0.05). The tenderness of breast muscle and leg muscle increased with the increase of mulberry leaf extract supplemental level, and the significant increase in group Ⅳ was found compared with control group (P<0.05). 4) Compared with the control group, the crude protein and crude fat contents in breast muscle and leg muscle in supplemented with mulberry leaf extract groups had different degrees increase but with no significant differences (P>0.05). 5) There were no significant differences in most amino acid contents in breast muscle and leg muscle in supplemented with mulberry leaf extract groups (P>0.05) except lysine (Lys), arginine (Arg), isoleucine (Ile) and leucine (Leu) contents in breast muscle and leg muscle had significant changes in some supplemented with mulberry leaf extract groups (P<0.05). No significant difference in the ratio of essential amino acid to non-essential amino acid was observed between supplemented with mulberry leaf extract groups and control group (P>0.05). 6) The saturated fatty acid (SFA), monounsaturated fatty acid (MUFA) contents in breast muscle and leg muscle had trend to increase with the increase of mulberry leaf extract supplemental level, and the unsaturated fatty acid (UFA), polyunsaturated fatty acid (PUFA), essential fatty acid (EFA), ω-6 and ω-3 contents, and UFA/SFA in breast muscle and leg muscle had trend to decrease with the increase of mulberry leaf extract supplemental level. It is indicated that mulberry leaf extract supplementation can effectively improve the growth performance and muscle quality of yellow dwarf chickens.