Automatic disc changing device of screening machine

The utility model discloses an automatic reel changing device of a screening machine, which comprises a bottom plate, a mounting groove is arranged at the top of the bottom plate, a mounting plate is connected in the mounting groove through a rotating mechanism, two take-up reels which are oppositely arranged are arranged at the top of the mounting plate, and a mounting mechanism used for fixing the take-up reels is arranged at the top of the mounting plate. The rotating block, the first motor, the first gear and the second gear are used in cooperation, so that the mounting plate rotates, the take-up reels rotate, after one take-up reel completes take-up work, the other take-up reel directly moves to the working position to conduct take-up work, automatic replacement work of the take-up reels is achieved, and the working efficiency is improved. And meanwhile, a second fixing plate is controlled to move through an electric push rod, so that a connecting block is separated from a connecting groove, the take-up