The authors develop an intelligent testing instrument of 1.06μm pulse laser rangefinder anti-jamming performance. The authors present the testing system which is divided into collimating optical system, opto-electronic conversion circuit, mainly-controlling circuit, driving circuit, multi-beams simulated source and computer interface. Based on the testing instrument above, the authors present and research several key techniques: To generate simulated ranging/jamming echoes, the authors present and develop the mainly-controlling circuit which is built with FPGA chip and additional circuits; meanwhile, the authors also develop a new type of multi-beams diode which can be the simulated source of the testing instrument; According to power supply characteristics of multi-beams diode, the authors present and develop a corresponding common cathode driving circuit. The anti-jamming performance testing experimental data shows that the testing result has higher precision.