The invention relates to a filter circuit separated-type microcomputer protection switching power supply plug, which comprises a switching power supply. The switching power supply is provided with an input loop and an output loop. The output loop comprises a rectifying circuit, a filter circuit, a first output electrode and a second output electrode; the filter circuit is detachably and electrically connected with the rectifying circuit, the first output electrode and the second output electrode. According to the filter circuit separated-type microcomputer protection switching power supply plug provided by the invention, a separated-type structure is adopted by the filter circuit, the rectifying circuit, the first output electrode and the second output electrode of the output loop, and the filter circuit and the rectifying circuit, the first output electrode and the second output electrode form a required detachable electric connection by matching contact pins. When the switching power supply is broken, the filter circuit can be rapidly replaced; the whole switching power supply does not need to be replaced, so that the operating maintenance cost is reduced, and the maintenance efficiency is improved. Meanwhile, the condition that spare parts cannot be purchased due to the fact that the production time of the switching power supply is longer, and the production is ceased in manufacturers. The filter circuit separated-type microcomputer protection switching power supply plug is compact in structure and safe and reliable.