Abstract: An automatic rubber powder plasticizing method which is used for recovery, processing and utilization of waste rubber, comprising the following steps: smash the waste rubber to powder in 10 meshes to 40 meshes, add some activator and softer according to certain weight ratio of rubber powder:activator:softener=1:0.3˜0.4%:8˜18%, evenly mix them, and then heat the mixture to 180˜320° C. and hold for 8˜15 min, afterwards, carry out desulfurization and plasticizing, then the plasticized rubber powder is obtained after cooling the resultant mixture. The invention also provides an apparatus for plasticizing which comprises a stirring unit (1), a feeding unit (2), a thermal reaction unit (3) and a cooling unit (4).