Device for quickly switching production size of product

The invention discloses a device for quickly switching the production size of a product. The device comprises a plurality of sets of nicking components arranged on a gypsum board production line at equal intervals along the same linear direction, wherein each set of nicking components comprises two nicking mechanisms which are oppositely arranged; and the distance between every two nicking mechanisms in the multiple sets of nicking components is sequentially increased in the setting direction. The multiple sets of nicking components are arranged, and the distances between the nicking mechanisms in the adjacent nicking components are different, machining of different nicking intervals on surface protection paper is achieved through the nicking mechanisms with different intervals in every two adjacent sets of nicking components, start-up on-line adjustment of the width size of the gypsum board is achieved, the problem that the production efficiency of the gypsum board is affected due to the fact that a large am