The invention discloses a zero-crossing trigger control circuit for an anti-parallel thyristor split-phase switched capacitor. The zero-crossing trigger control circuit comprises an input/output signal photoelectric isolation unit, a control processing unit, a zero-crossing detection unit and a drive isolation unit; the input/output signal photoelectric isolation unit generates a low-level control signal according to an external control signal, and sends the low-level control signal to the control processing unit; the zero-crossing detection unit detects voltages at two ends of a thyristor, and sends the voltages to the control processing unit; when the voltages at the two ends of the thyristor are equal, the control processing unit generates a drive signal for controlling starting of the thyristor according to the low-level control signal, and sends the drive signal to the drive isolation unit; when the voltages at the two ends of the thyristor are unequal, the control processing unit generates a stop signal for controlling turn-off of the thyristor, and sends the stop signal to the drive isolation unit; and the drive isolation unit drives zero-crossing triggering of the thyristor according to the drive signal, and stops driving the zero-crossing triggering of the thyristor according to the stop signal. The zero-crossing trigger control circuit can prevent non-zero-crossing triggering of the thyristor.