Automatic speed-changing electric controller of pumping unit

The utility model discloses an automatic speed-changing electric controller of pumping unit, including the phase A of a power circuit connected with one end of a fuse, an intermediate relay with the series-wound normally-open points connected with the other end of the fuse. One side of the output ends of the intermediate relay connects with a stop button, a start-up button, a normally closed contact of a contactor 2C, a contactor 1C and a heat relay 1JR, the other side connects with a N line, the other output end of the intermediate relay connects with the input end of a reversal controlling button. The normally-open point of the intermediate relay ZJ, a time relay SJ, and the normally-open point of the intermediate relay ZJ are connected between the input end of the reversal controlling button and the N line in series. The normally open point circuit of the heat relay connects with the input end of the shunt release of the main switch. The utility model has the advantages of expedient operation, simple structure, effective control of the clockwise & counterclockwise rotation and stop of the pumping unit.