A method for establishing an optocoupler SPICE model includes: establishing at least three performance-state optocoupler SPICE models respectively from optocoupler circuits that correspond to at least three performance states; establishing, according to a maximum performance state, a minimum performance state, and a typical performance state of the at least three performance states that correspond to the at least three performance-state optocoupler SPICE models, three selection circuits for each of an input end and an output end; and correspondingly connecting an input-end first selection circuit, an input-end second selection circuit, an input-end third selection circuit, an output-end first selection circuit, an output-end second selection circuit, and an output-end third selection circuit to two sides of the at least three performance-state optocoupler SPICE models, so as to establish the optocoupler SPICE model.