The utility model provides a transmission system is pull in two -way removal of single action power comprises driving system, support, special -shaped pivot, pulling force adjustment mechanism, assembly pulley and haulage rope, driving system installs in the support outside, driving system includes motor and reduction gear two parts, the reduction gear mainly with the high speed adjustment of motor to the slow -speed of revolution and export special -shaped pivot on. Technical scheme's beneficial effect lies in: the transmission system that pulls realized that one set of driving system realizes the two -way removal of object, special design's special -shaped pivot, through on rim surface hot melt copper base powder metallurgy layer, the effectual frictional force that has strengthened between rope or cable wire and the pivot is applicable to the drawknot of great effort, special design's pulling force adjustment mechanism can adjust the tension of rope or cable wire, simultaneously in real time as required novel pulling force adjustment mechanism simple structure has, convenient to use makes characteristics convenient and low in production cost.