Abstract: In laser equipment test, a laser receiver is tested by receiving laser pulses at specific wavelength transmitted by a signal simulator and observing its response. It is an effective way to evaluate the performance of the laser equipment. Based on the analysis of emitting mechanism of LED, we proposed a method to simulate 1.06 m guided laser pulse with LED, and designed the driving circuit of LED laser signal simulator with easy-to-adjust frequency and duty cycle. Experimental results show that the driving circuit has good adjustability of frequency and duty cycle.