Film roller replacing device

The utility model discloses a film roller replacing device which comprises the following components: a box body which comprises a base plate and side plates which are arranged at two sides of the base plate, the base plate is provided with two guiding grooves, one end of each guiding groove is communicated with the outside, and the same positions of the two side plates are provided with through holes; four pulleys distributed in a matrix mode are arranged at the bottom of the trolley, the positions of the pulleys correspond to the two guide grooves, two supporting frames are arranged at the top of the trolley, the two supporting frames are used for horizontally placing the film roller, and assembling grooves are formed in the two ends of the film roller; the two limiting assemblies are symmetrically arranged on the outer walls of the two side plates, and when the trolley moves to the box body, the limiting assemblies are used for penetrating through the corresponding through holes and then being inserted into