Chemical wastewater treatment device

The invention discloses a chemical wastewater treatment device, which comprises a stirring pool, a stirring mechanism arranged above the stirring pool, and a negative pressure cylinder arranged in the stirring pool, the outer side of the negative pressure cylinder is provided with a plurality of spiral grooves for water feeding, the negative pressure cylinder internally comprises an adsorption film, a purification precipitation cylinder and a rotating cylinder, the purification precipitation cylinder is sleeved in the negative pressure cylinder, and the rotating cylinder is arranged in the adsorption film. A plurality of second communication windows are formed in the barrel wall of the purification precipitation barrel, a purification pipe is sleeved with the purification precipitation barrel, each second communication window communicates with the top of the purification pipe, and the bottom of the purification pipe is connected with a drainage pipe; a plurality of second communicating windows are formed in t