The invention discloses a water pump control cabinet with a self-coupled voltage-reduced starting function. The water pump control cabinet adopts the structure that the input end of a circuit breaker is connected with a power input end; the output end of the circuit breaker is connected with both a PLC control system and an alternating current contactor; the signal output end of the PLC control system is connected with an auto-transformer through the alternating current contactor; the output end of the auto-transformer is connected with at least one water pump motor; and the alternating current contactor is connected with the water pump motor through a thermal overload relay. The water pump control cabinet provided by the invention is reasonable in design and simple in structure, and can effectively protect a power grid and a pipe network from a relatively great impact caused by the starting current. Furthermore, primary equipment and secondary equipment can be effectively separated from each other, so that maintenance personnel are effectively protected from electric shocks when maintaining the secondary equipment, the personal safety of the maintenance personnel is improved, and a high level of protection is achieved.