Dragging type engineering machinery and power supply control system thereof

The utility model relates to a power supply control system, in order to solve the problem of safe and stable power supply of the power supply control system of the existing power-dragging type engineering machinery, the utility model provides the power-dragging type engineering machinery and the power supply control system thereof, and in the power supply control system, a first switching power supply is electrically connected with commercial power; the second switching power supply is electrically connected with the mains supply through the residual-current circuit breaker; an electric operating mechanism of the residual-current circuit breaker is electrically connected with the first switching power supply; the key switch is electrically connected with the first switching power supply; two ends of an electromagnetic coil of each electromagnetic switching device are electrically connected with the key switch and the first switching power supply respectively; the low-voltage electric appliance is electrically