The invention relates to a direct current bus capacitor automatic discharge circuit for power electronic equipment. The direct current bus capacitor automatic discharge circuit for the power electronic equipment comprises a bus over-voltage detecting unit, a driving protection unit, a discharge loop unit and a power supply unit. The input end of the bus over-voltage detecting unit is connected with a positive electrode VDC of a bus capacitor and the output end of the power supply unit. The input end of the driving protection unit is connected with the output end of the bus over-voltage detecting unit. The control end of the discharge loop unit is connected with the output end of the driving protection unit. The input end of the discharge loop unit is connected with the positive electrode VDC of the bus capacitor, and the other end of the discharge loop unit is connected with a reference ground of the bus capacitor. The power supply unit is connected with the positive electrode VDC of the bus capacitor, and the output end of the power supply unit is connected with the input end of the bus over-voltage detecting unit. The bus over-voltage detecting unit is used for detecting the bus voltage, when the bus voltage is larger than a given voltage, the driving protection unit starts the discharge loop unit, and then the bus voltage value is reduced. A pure hardware circuit is used for building the direct current bus capacitor automatic discharge circuit for the power electronic equipment, so that a system is safe and reliable, the direct current bus capacitor automatic discharge circuit for the power electronic equipment is simple in structure, an external auxiliary element is not needed, cost is low, and universality is high.