The invention discloses a low switching loss control method for a three-level rectifier, which is particularly suitable for controlling a diode clamping type three-level rectifier. A voltage and current detection device is arranged between a three-phase power grid and a three-phase electric reactor, the data of voltage and current is obtained through the measurement of the voltage and current detection device, an output instruction reference voltage of the three-phase power grid is obtained through a controller, the action time of a three-phase effective impulse is corrected, the action time of the three-phase effective impulse is sent to the controller, an output impulse is generated through the controller, and then the three-level rectifier is driven to conduct the low switching loss operation. As three phases in the three-phase power grid work at the same time, namely the three phases are injected with zero-sequence components at the same time, the current flowing through a middle point is changed, the balanced control over the capacitor voltage on a direct current side is achieved, the voltage effective value of an output line is not changed, the calculated amount is simplified, and the low switching loss is controlled according to the fluctuation condition of the potential of the middle point and the working condition of the rectifier, so that the purpose of reducing the switching loss of the rectifier is achieved.