Cleaning device for fermentation tank

The invention is applicable to the technical field of feed fermentation, and provides a cleaning device for a fermentation tank, comprising: a cleaning assembly comprising a rotating seat, the rotating seat is rotatably arranged below a top seat, a plurality of cross rod groups are arranged below the rotating seat, moving blocks are hinged to both ends of the top of the cross rod groups, threaded shafts penetrate through the moving blocks, and the threaded shafts are rotatably arranged in the top seat; the bottom end of the cross rod set is hinged to a mounting base, a sliding rod is arranged on the mounting base in a sliding mode, a side scraping plate is arranged on the sliding rod, an ejector rod is arranged on the rotating base in a penetrating mode, the ejector rod penetrates into the top base and then is connected with a first screw rod, a threaded groove is formed in the top base, the first screw rod is sleeved with a sleeve, the sleeve is arranged between the rotating base and the top base, inner ratc