The present invention belongs to the technical field of electrical control, and relates to a discharge control circuit of a pulse apparatus and particularly relates to a silicon bidirectional switch (SBS)-based self-triggered discharge control circuit. The circuit is based on an SBS. Partial pressures of a resistor R1 and a resistor R2 are set through a turning voltage of the silicon bidirectional switch. When the voltage of the resistor R2 reaches the turning voltage of the silicon bidirectional switch, Q1 of the silicon bidirectional switch is connected instantly, the silicon bidirectional switch triggers Q2 to be connected, a primary level of a trigger transformer T1 is triggered, a secondary level senses a corresponding pulse, a thyristor Q3 is triggered to be connected, and then discharge output is completed. The circuit can realize self-triggered discharge without using a control signal of a front end circuit. The SBS (silicon bidirectional switch) is combined with controllable silicon, and a certain value of resistor and capacitor are configured, so that the self-triggered discharge circuit is formed. The SBS-based self-triggered discharge control circuit can adjust energy storage voltage accurately, uses a semiconductor part, and has a long service life, high reliability, and high anti-interference capability. The present invention provides a novel discharge control circuit for the pulse apparatus.