The experiment was conducted to study the effect of different adding levels of soybean meal extracts（SME） on the immune function and antioxidant capacity in broilers’ diet in order to provide a scientific basis for itsapplication in production. 150 1-day-old Avian broilers were randomly assigned to 5 groups, with three replicatesper group. The control group was fed with basal diet and trial groups was added to soybean meal extract at four con-centrations of 250 mg/kg, 500 mg/kg, 750 mg/kg and 1000 mg/kg, respectively. The experiment lasted for 49 days.Results showed that SME increased thymus index and bursa of Fabricius index significantly（P＜0.05）. SME obvious-ly improved broilers’ serum immunoglobulin Ig A, Ig G and Ig M level（P＜0.05）. SME increased SOD and CAT con-tent and decrease MDA content in serum remarkably（P＜0.05）. In a word, SME increased the immune function andantioxidant capacity of broilers, especially 750 mg/kg supplementation of SME had the most obvious effect.