An automatic rubber powder plasticizing process, wherein the detailed process is as follows: Step 1, ingredients mixing: smash the waste rubber to powder in 10 mesh to 40 mesh, add activator and softener according to the weight ratio of: rubber powder: activator: softener =100%:0.3∼0.4%:8∼18%, then evenly mix them; Step 2, desulfurization and plasticizing: heat the mixture obtained according to Step 1 to 180∼320°C and hold for 8 to 15 min to carry out desulfurization and plasticizing to get the plasticized rubber powder; Step 3, cooling: cool the plasticized rubber powder after plasticizing to 80°C and below, then the resultant product is directly used or packaged for use; wherein said activator is 450B or 510; wherein said softener is pix carbonis or pine tar; wherein the process is performed by an automatic plasticization apparatus which comprises a stirring unit, a feeding unit, a thermal reaction unit and a cooling unit, wherein the thermal reaction unit is provided with a heating piece, the cooling unit is equipped with a cooling circulation piece, the outlet of the stirring unit is communicated with the inlet of the feeding unit, the outlet of the feeding unit is communicated with the inlet of the thermal reaction unit, and the outlet of the thermal reaction unit is communicated with the inlet of the cooling unit; wherein said feeding unit is designed to be a spiral conveyance unit I; wherein said thermal reaction unit is designed to be a spiral conveyance unit II, and a heating piece is configured outside the spiral conveyance unit II, the heating piece of the thermal reaction unit is designed to be a heat-transfer oil heating circulation unit; wherein said cooling unit is designed to be a spiral conveyance unit III, and a cooling circulation unit is configured outside the spiral conveyance unit III; wherein the cooling circulation piece of said cooling unit is designed to be a water-cooling circulation piece; wherein an electric control unit is further provided for the said automatic rubber powder plasticizing process apparatus; and wherein the stirring unit, the feeding unit, the thermal reaction unit and the cooling unit are electrically coupled to the electric control unit. Step 1, ingredients mixing: smash the waste rubber to powder in 10 mesh to 40 mesh, add activator and softener according to the weight ratio of: rubber powder: activator: softener =100%:0.3∼0.4%:8∼18%, then evenly mix them; Step 2, desulfurization and plasticizing: heat the mixture obtained according to Step 1 to 180∼320°C and hold for 8 to 15 min to carry out desulfurization and plasticizing to get the plasticized rubber powder; Step 3, cooling: cool the plasticized rubber powder after plasticizing to 80°C and below, then the resultant product is directly used or packaged for use; wherein said activator is 450B or 510; wherein said softener is pix carbonis or pine tar; wherein the process is performed by an automatic plasticization apparatus which comprises a stirring unit, a feeding unit, a thermal reaction unit and a cooling unit, wherein the thermal reaction unit is provided with a heating piece, the cooling unit is equipped with a cooling circulation piece, the outlet of the stirring unit is communicated with the inlet of the feeding unit, the outlet of the feeding unit is communicated with the inlet of the thermal reaction unit, and the outlet of the thermal reaction unit is communicated with the inlet of the cooling unit; wherein said feeding unit is designed to be a spiral conveyance unit I; wherein said thermal reaction unit is designed to be a spiral conveyance unit II, and a heating piece is configured outside the spiral conveyance unit II, the heating piece of the thermal reaction unit is designed to be a heat-transfer oil heating circulation unit; wherein said cooling unit is designed to be a spiral conveyance unit III, and a cooling circulation unit is configured outside the spiral conveyance unit III; wherein the cooling circulation piece of said cooling unit is designed to be a water-cooling circulation piece; wherein an electric control unit is further provided for the said automatic rubber powder plasticizing process apparatus; and wherein the stirring unit, the feeding unit, the thermal reaction unit and the cooling unit are electrically coupled to the electric control unit.