: People sure that Soursop leaves (A.muricata L.) has a lot of advantage for health, one example is to reduced blood glucose levels. The objectives of this research were to study the effectiveness of administration of soursop leaves extract (A.muricata L.) on blood glucose levels of wistar rat (R.norvegicus) induced by alloxan. The subjects in these research were male wistar rat with total of 18 samples divided into 6 groups as follows negative control group and 5 hyperglycemic groups induced by alloxan with dose 110 mg/kg bodyweight of rat. Hyperglycemic rats administered by soursop leaves extract dosing 1000 mg, 2000 mg, and 5000 mg/kg bodyweight of rat, positive control groups administered by novomix flexpen, and the last one only administered by alloxan. Data taken from measurement of blood sugar on first day, second day, and third day on minutes 0,30,60,90, and 120. The result showed reduction of alloxan-induced wistar rat\u27s blood sugar levels on administration of soursop leaves extract