The invention discloses a chemical sewage filter device. The device comprises a filter box body, the top on the left side of the filter box body is communicated with a water inlet pipe, and the top ofthe filter box body is movably connected to a box cover, placement blocks are fixedly connected to two sides of the inner cavity of the filter box body, and the tops of the placement blocks are in flexible connection with a coarse grain filter screen. According to the invention, through the cooperative use of the filter box body, the water inlet pipe, the box cover, the placement blocks, the coarse grain filter screen, a fiber filter layer, an activated carbon plate, a condensation box, a circulating pipe, a condensation pipe, a water pumping pipe, a water pump, a water delivery pipe, a mixing box body, a motor, a pinion, a casing pipe, a large gear, a bearing, a sliding chute, a vertical rod, pulleys, vertical plates, a roof plate, an electric telescopic rod, connecting rods, stirring blades, a dosing pipe and a water outlet pipe, and blending with disinfectant liquid medicine, the sewage treatment effect can be better, the device can prevent secondary pollution caused by sewage, also prevents scald of high temperature sewage to operators, and makes sewage filtration more thorough.