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Aiming at the problem of large interference in signal transmission and poor stability of parameter adjustment, a new neutron pulse signal pre-processing system is designed. This system has the function of adjusting parameters intelligently, and is integrated as a whole with the preamplifier, pulse main amplifier and high voltage power supply. Using integrated and modular technology, the system is divided into pre-processing device and adjustment control box according to different functions; the pre-processing device includes pulse amplifier module, parametric adjustment module, low voltage power supply module and high voltage power supply module. Using intelligent regulation technology, the remote software parameter setting function based on SPI bus is designed, and meanwhile, the digital potentiometer is introduced for keyless adjusting the screening threshold and high voltage. The test results illustrates that this system can effectively and conveniently acquire the key working parameters, and satisfies the requirement of acquiring accurate neutron counting rate by data acquisition device of nuclear measurement equipment.