The invention discloses a novel folding plug. The novel folding plug comprises an upper cover plate, a lower bottom plate, a lead, an adjusting knob, inserting sheet sliding grooves, inserting sheet bases, inserting sheets and inserting grooves; the upper cover plate is arranged on the back surface of the lower bottom plate; the lead is arranged at the left side of the middle position between the upper cover plate and the lower bottom plate; the adjusting knob is arranged at the lower part of the upper cover plate; the inserting sheet sliding grooves are respectively arranged in the outer parts of the upper and lower inserting sheet bases, and the inserting sheet bases are respectively arranged at the right ends of the inserting sheets at the inner parts and the middles of the upper and lower inserting sheet sliding grooves; the inserting grooves are arranged at the lower parts of all inserting sheets. According to the novel folding plug, the inserting sheet sliding grooves, the upper cover plates and the lower bottom plates are arranged, which is beneficial for the flexible switching between a two-core plug and a three-core plug, and the carrying is convenient; moreover, the manufacturing cost is reduced, the popularization and application can be carried out conveniently, and the applicability and practicability are improved.