Automatic medicament adding device for sewage treatment plant

The utility model discloses an automatic medicament adding device for a sewage treatment plant, which comprises a box cover, a first box body is arranged at the bottom end of the box cover, a second box body is arranged at the bottom end of the first box body, the first box body and the second box body are both used for adding and containing factory medicaments, and an auxiliary mechanism is arranged between the first box body and the second box body. The auxiliary mechanism comprises a threaded cylinder, a fixing ring, a supporting ring, a connecting ring, a connecting cylinder and an anti-disengaging rod. The outer wall of the threaded cylinder is connected with an inner cavity of the connecting ring in a threaded penetrating mode. The first box body, the second box body, the threaded cylinder, the fixing ring, the supporting ring, the connecting ring, the connecting cylinder and the anti-falling rod are matched with one another, the first box body and the second box body are used for splitting the adding b