The utility model belongs to the field of an electrical driving circuit, and aims to provide a self-powered circuit of a power semiconductor switch driving circuit. The self power supply circuit of the power semiconductor switch driving circuit comprises the components of: a power semiconductor switch, a driving circuit thereof, a voltage-reducing rectifying circuit, a battery charging and discharging circuit, a filtering capacitor and an isolation conversion voltage stabilizing circuit. The voltage-reducing rectifying circuit is connected with two ends of the main circuit of the power semiconductor switch. The voltage-reducing rectifying circuit, the battery charging and discharging circuit, the isolation conversion voltage stabilizing circuit and the filtering capacitor are connected successively. Module isolation is adopted for the isolation conversion voltage stabilizing circuit. The anode and the cathode of the driving circuit are respectively connected with anode and the cathode of the filtering capacitor. The cathode of the driving circuit is connected with the cathode of the power semiconductor switch in a co-ground connection manner. The self power supply circuit of the power semiconductor switch driving circuit is beneficial in that: no electromagnetic component is required for providing a driving power supply; high isolation capability is realized; voltage which is output from the voltage-reducing rectifying circuit is used for powering and simultaneously for charging the battery; a standby battery can perform emergency power supply for ensuring safe stoppage of the equipment; and an optical fiber transmits pulse signals in one direction and small line interference is realized.