The embodiment of the invention provides a signal output control circuit, comprising: a booster circuit and an optical coupler; The input of the boost circuit is used for receiving two pulse frequencysignals, and the output of the boost circuit is connected with the power supply pin of the optocoupler. The step-up circuit is configured to output a step-up voltage if it is confirmed that the phases of the two pulse frequency signals are opposite. The input positive electrode of the optocoupler is used for receiving the input signal, the input negative electrode of the optocoupler is used for receiving the added two pulse frequency signals, and the output terminal of the optocoupler is used for outputting the output signal corresponding to the input signal. The signal output control circuitprovided by the embodiment of the invention can confirm that the phase of the pulse frequency signal is opposite by using the voltage boosting circuit and the optical coupler, thus ensuring that theprocess of collecting data is free from error, thereby ensuring that the output signal is a safety signal, and improving the safety and reliability of the system operation.