The embodiment of the invention provides a method and a device for rapidly starting the electromagnetic transient simulation of an alternating and direct current hybrid system. The method comprises the following steps: obtaining a tide fracture surface; from the tide fracture surface, starting the electromagnetic transient simulation of the target alternating and direct current hybrid system, wherein the tide fracture surface is generated by carrying out climbing starting control on the target alternating and direct current hybrid system based on a tide calculation result of the target alternating and direct current hybrid system. By using the tide fracture surface provided by the tide calculation result of a large-scale system and setting the starting mode switching of a synchronous machine, rapid starting to a steady state for the electromagnetic transient simulation of the target alternating and direct current hybrid system can be realized, the calculation resources can be utilizedmore reasonably, and the simulation calculation efficiency is improved effectively.