The utility model discloses a tank body tea quality screening pretreatment device. Treatment tank, a rotating motor is fixedly mounted at the top of the treatment tank; an output shaft of the rotatingmotor is fixedly connected with the top of a rotating rod, the bottom of the rotating rod is inserted into the treatment tank, the surface of the rotating rod is rotatably connected with the inner wall of the treatment tank, two outward-opening doors are fixedly installed at the top of the treatment tank, lifting blocks are fixedly connected to the two side walls of an inner cavity of the treatment tank, and swing arm rods are hinged to the side faces of the lifting blocks. The utility model discloses a tank tea quality screening pretreatment device. The servo motor controls the rotating speed of the rotating shaft; the eccentric pieces are driven to rotate continuously, namely, the multiple eccentric pieces abut against the screen drum at the top continuously, so that the screen drum oscillates back and forth continuously, meanwhile, the rotating motor drives the rotating rod to rotate, the stirring plate is used for stirring tea leaves inside the screen drum continuously, and tea residues and impurities in the tea leaves inside the screen drum are effectively removed.