The invention discloses an electronic equivalent testing device for a spacecraft initiating explosive device line, and the device achieves the detection of various parameters in the initiating explosive device line through the method design of an integrated circuit, selects an explosion initiation loop in a mode of solid-state power controller (SSPC) contact switching, and simulates the normal state, short-circuit state, circuit break state and other abnormal states of an explosion initiation line of an initiating explosive device. The invention solves problems that the initiating explosive device cannot be reused, the danger coefficient is large, the experiment cost is high and the explosion initiation current cannot be measured because a real initiating explosive device has to be used in the conventional spacecraft initiating explosive device line testing.