The invention discloses a circuit for realizing a Morris-Lecar neuron model by simulation. The circuit comprises a first hyperbolic tangent function circuit unit, a second hyperbolic tangent function circuit unit, a hyperbolic cosine function circuit unit, a first proportional integral circuit unit and a second proportional integral circuit unit. The circuit consists of basic simulating electronic components such as an operational amplifier, a transistor, an adder, a multiplier, a resistor and the like. The circuit is simple in structure, flexible and convenient in parameter adjustment and high in output precision; and along with the change of circuit parameters, the circuit can simulate various discharge forms of resting-state, spiking, bursting and the like of the Morris-Lecar neuron model.