This experiment was conducted to evaluate the effects of dietary vitamin B₂ level on growth performance, nutrient digestibilities and nitrogen metabolism of growing minks. Ninety-six healthy short black male minks at the age of (65±5) days with the similar weight[(1 213.38±72.72) g] were randomly divided into 6 groups with 16 replicates per group and 1 mink per replicate. The experiment used a single factorial experiment design, and the dietary vitamin B₂ supplemental levels of 6 groups were 0 (group Ⅰ), 2.5 (group Ⅱ), 5.0 (group Ⅲ), 10.0 (group Ⅳ), 20.0 (group Ⅴ) and 40.0 mg/kg (group Ⅵ), respectively. The adaptation period lasted for 7 days and the formal period lasted for 58 days. The results showed as follows:1) dietary vitamin B₂ level had significant effects on the final weight and feed to gain ratio of minks (P<0.05), and had extremely significant effect on the average daily gain of minks (P<0.01), the average daily gain and final weight of group Ⅴ were the highest, while the feed to gain ratio was the lowest. The average daily gain of group Ⅴ was significantly higher than that of groups Ⅰ, Ⅱ, Ⅲ and Ⅳ (P<0.05 or P<0.01), the feed to gain ratio of groups Ⅴ and Ⅵ was significantly lower than that of group Ⅰ (P<0.05 or P<0.01), the final weight of groups Ⅴ and Ⅵ was significantly higher than that of group Ⅰ (P<0.05). 2) Dietary vitamin B₂ level had extremely significant effects on the crude protein digestibility and ether extract digestibility of minks (P<0.01), while had no significant effects on the dry matter intake, dry matter output and dry matter digestibility of minks (P>0.05). The ether extract digestibility of group Ⅵ was the highest, which of group Ⅰ was the lowest, the ether extract digestibility of group Ⅰ was extremely significantly lower than that of groups Ⅱ, Ⅴ and Ⅵ (P<0.01). The crude protein digestibility of group Ⅴ was the highest, which was extremely significantly higher than that of group Ⅰ(P<0.01). 3) Dietary vitamin B₂ level had significant effects on the nitrogen deposition, net protein utilization and the biological value of protein of minks (P<0.05), while had no significant effects on the nitrogen intake, fecal nitrogen and urine nitrogen of minks (P>0.05). The net protein utilization rate of group Ⅴ was the highest, which was significantly higher than that of groups Ⅰ and Ⅱ (P<0.05), but had no significant difference with that of groups Ⅲ, Ⅳ and Ⅵ (P>0.05). The biological value of protein of group Ⅴ was the highest, which of groups Ⅴ and Ⅵ was significantly higher than that of group Ⅰ (P<0.05), but had no significant difference with that of groups Ⅱ, Ⅲ and Ⅳ (P>0.05). The nitrogen deposition of group Ⅵ was the highest, which of group Ⅰ was the lowest, the nitrogen deposition of group Ⅰ was significantly lower than that of groups Ⅴ and Ⅵ (P<0.05), but had no significant difference with that of groups Ⅱ, Ⅲ and Ⅳ (P>0.05). Considering all the factors, when dietary vitamin B₂ level is 20 mg/kg (dietary vitamin B₂ level is 23.35 mg/kg), growing minks can obtain the better growth performance and higher nutrient digestibilities and nitrogen utilization under the condition of this experiment.