This research aims to test antidiabetic using alloxan induction on mice test animals. The type of research used is experimental, which includes sampling, sample determination. Extract preparation with ethyl acetate solvent, extract characteristics test and simplicia, extract and simplicia screening test. Antidiabetic testing was carried out using male mice as test animals. Screening tests for the presence of alkaloids, flavonoids, tannins, saponins, steroids, and glycosides for the anti-diabetic test of Sungkai leaves were carried out using alloxan induction in mice. With initial KGD 90-120 mg/dl. Extract concentrations were 100 mg/kg, 200 mg/kg and 300 mg/kg with negative control CMC Na 0.5% and metformin positive control 65 mg/kg. The most effective decrease in mice blood glucose on days 3, 7, 10 and 14 was at an extract concentration of 300 mg/kg bw with a decrease of 114 mg/dl. Based on the results of the ANOVA statistic Fcount 208.813> Ftable 2.87 so H0 is rejected, there is a significant decrease in blood sugar in mice. The results of the anti-diabetic test of the ethyl acetate extract of Sungkai leaves at a dose of 300 mg/kg body weight had an anti-diabetic effect on male mice after alloxan induced on the 14th day with an average of 114 being the most effective in reducing the male mice's KGD.