Water treatment device capable of effectively degrading COD

The invention discloses a water treatment device capable of effectively degrading COD. The device comprises a treatment box, a bottom of the treatment box is connected with a base, a first driving motor is arranged at a top of the treatment box, an output shaft of the first driving motor is connected with a disturbance shaft, combined stirring rods are arranged at an upper part of the disturbanceshaft, a disturbance frame is arranged at a bottom of the disturbance shaft, a spiral disturbance blade is arranged on the disturbance shaft in the disturbance frame, disturbance inclined rods are symmetrically arranged on two sides of the disturbance frame, and a sewage inlet is formed in a top of the treatment box. According to the invention, wastewater is fed into the treatment box from the sewage inlet, then a treating agent on the market is added, the first driving motor is started, the disturbance shaft is rotated, then a large stirring rod and a small stirring rod are driven to rotate,meanwhile, the arc-shaped