The invention claims protection of a pulse neural network neuron circuit based on a LIF (Leaky Integrate and Fire) model, which belongs to the field of integrated circuit design. The circuit mainly includes: a membrane potential accumulation circuit, a leakage circuit, a pulse generation circuit, a refractory period circuit and a reset circuit. The invention not only realizes the integral leakage ignition function of the LIF neuron model, but also simulates the refractory period characteristic of the biological neuron, wherein the refractory period is adjustable. The present invention is based on CMOS technology, the circuit structure is simple, and the sub-threshold region MOS tube is mostly used in the circuit, so that the neuron circuit has ultra-low power consumption characteristics; the input current of the circuit is pA level, and the output pulse frequency is Hz level, which can be very good It simulates the typical working state of biological neurons, effectively realizes the functions of neurons, and can be used to realize large-scale spiking neural network systems.