The invention provides a pumped well control box and control method. The pumped well control box comprises an AC contactor, an opening button, a time relay and a current relay; in a main loop, phasesA, B and C are respectively connected with an A-phase power input end, a B-phase power input end and a C-phase power input end of a pumped well motor by a first normally-open switch, a second normally-open switch and a third normally-open switch of the AC contactor, and a coil of the current relay is connected in series between the normally-open switches of the AC contactor and three phase power input ends of the pumped well motor; in a secondary loop, a fourth normally-open switch of the AC contactor is connected in parallel with the opening button, one end of the fourth normally-open switchof the AC contactor is connected with C phase power, and the other end of the fourth normally-open switch is connected with a first node; a first branch and a second branch are connected in parallel between the first node and a second node; and the second node is connected with B phase power. According to the pumped well control box and control method provided by the invention, a power supply canbe automatically cut off during no-load running of the pumped well control box, the standby loss is prevented, and electric energy is saved.