The invention discloses an artificial
synaptic device based on a photoelectric
coupling memristor and a modulation method of the artificial
synaptic device. The artificial
synaptic device comprises an upper
electrode, a lower
electrode and a functional material layer, wherein the functional material layer is arranged between the upper
electrode and the lower electrode, the upper electrode, the functional material layer and the lower electrode jointly form a sandwich structure, the functional material layer is made of a material having a
photoelectric effect, the lower electrode is a transparent conductive electrode, an electrical
signal is input through the upper electrode and the lower electrode, and an optical
signal is input through the transparent conductive electrode. In the artificial synaptic device provided by the invention, light is introduced as a
control signal of the other end except the electrical
signal, two control ends of the artificial
synapse device are expanded to three ends, the artificial synaptic device can generate resistance change under an external optical
excitation signal by the additionally-arranged end, the artificial synaptic device can be configured to be in a plurality of resistance states correspondingly by selection and control of intensity, frequency and optical
pulse time of the optical
excitation signal, and various
synaptic plasticity functions are correspondingly achieved.