The utility model discloses a silicon controlled rectifier (SCR) low-voltage trigger test apparatus which comprises an AC power supply, an isolation transformer, an air switch, an SCR, a control impulse generation module, a photoelectric conversion module and a valve control system, wherein two ends of the AC power supply are connected with the two primary ends of the isolation transformer, the air switch and the SCR are serially connected between the two secondary ends of the isolation transformer, the signal output end of the control impulse generation module is connected with the signal input end of the valve control system through the photoelectric conversion module, and the signal output end of the valve control system is connected with the control end of the SCR. The SCR low-voltage trigger test apparatus further comprises a synchronous voltage collector, and the two ends of the input interface of the synchronous voltage collector are connected with the two ends of the AC power supply. The voltage synchronous signal output end of the synchronous voltage collector is connected with the voltage synchronous signal input end of the control impulse generation module. The SCR low-voltage trigger test apparatus realizes synchronization of test voltage and control impulse, and ensures the accuracy of an SCR low-voltage trigger test.