Provided is a system for controlling the opening and closing of a drain valveof a washing machine. The system includes the drain valve of the washing machine, and an opening-and-closing control circuit; the opening-and-closing control circuit includes a relay K1, a capacitor C1,a controller, a switch K, a relay K2, a resistor R1/R2/R3, a time relay S1/S2, and a driver; two ends of the capacitor C1, two ends of the controller and two ends of the relay K1 are connected with a power supply, a first pin of the controller is connected to coils of the time relay S1, a second pin of the controller is connected to coils of the time relay S2 and connected with the relay K2 at the same time, the time relay S1 and the time relay S2 are connected in parallel, a normally-open pin of the time relay S1 is connected with the resistor R1, a normally-open pin of the time relay S2 is connected with the resistor R2, one end of the driver is connected with the time relay S1/S2, the switch K is connected with the resistor R3, and the other end of the resistor R3 is connected with a normally-open pin of the relay K1.