The invention provides an engine oil pressure and temperature sensor signal simulating device. A power module supplies power to a processor module. A signal setting module outputs a voltage signal forsetting a sensor state signal, a voltage signal for setting an engine oil temperature signal and a voltage signal for setting an engine oil pressure signal to an analog quantity input end of the processor module correspondingly. The processor module outputs a PWM signal to an analog input end of a signal mode control module according to the input three voltage signals. The engine oil pressure andtemperature sensor signal simulating device can achieve simulation of the PWM signal of an engine oil pressure and temperature sensor and can set the three parts including the sensor state signal, the engine oil temperature signal and the engine oil pressure signal correspondingly, and the engine oil pressure and temperature sensor signal simulating device has the features that simulation of thePWM signal of the sensor is accurate, use is convenient and rapid, and the performance is reliable.