The utility model relates to a coal-to-methanol wastewater treatment device. The device comprises a mixing tank, a hopper, a feeder, a water spraying cover, a disc water spraying head, a liquid pump,a flow meter and a controller, a discharge hole in the lower part of the hopper is connected with a feeding hole of the feeder; a water spraying cover is arranged at a discharging opening in the lowerportion of the feeder, the lower portion of the water spraying cover extends into the mixing tank, the disc water spraying head is arranged in a cover body of the water spraying cover, a water outletof the liquid pump is communicated with the disc water spraying head through a pipeline, and the feeder and the liquid pump are electrically connected with the controller. According to the utility model, materials required for treating the coal-to-methanol wastewater can be uniformly and quickly added into the wastewater, and can be quickly dissolved in the wastewater with flow velocity, so thatthe wastewater treatment process is more efficiently promoted. And the ratio of the added materials to the wastewater can be flexibly adjusted.