Rapid automatic roller changing device

The utility model relates to the technical field of roller changing of leveling machines, in particular to a rapid automatic roller changing device which comprises a transmission device, a leveling mechanism and a roller changing trolley, the transmission device comprises a first motor, a speed reducer and a first clutch, and the first clutch is driven by a first air cylinder to move on an output shaft of the speed reducer; the leveling mechanism comprises an upper roller system and a lower roller system which are connected with the distribution box body, and a second clutch connected with the first clutch is arranged on an output shaft of the distribution box body; the roller changing trolley is connected with the leveling mechanism through a second oil cylinder and comprises an upper frame body assembly and a lower base assembly which are connected in a sliding mode, the upper frame body assembly comprises a dragging mechanism and an automatic lifting mechanism, the dragging mechanism drives a hook to move,