The utility model provides a device for removing suspended matters in water. The device comprises a closed shell body, wherein a cavity is arranged at the inner part of the closed shell body, a water inlet pipe and a water discharging pipe are arranged on the shell body, a separating plate in the cavity is used for dividing the cavity into a coagulating cavity and a slope precipitation cavity, a first separating plate is arranged in the coagulating cavity and is used for dividing the coagulating cavity into a coagulating area and a flocculating area, the coagulating area is communicated with the flocculating area through a water inlet at the top of the first separating plate, a flow-disturbing device is arranged in the coagulating area, the coagulating area below the flow-disturbing device is communicated with the water inlet pipe, an opening is arranged at the bottom of the separating plate and is used for communicating the coagulating area and the slope precipitation cavity, a water collecting tank is arranged on a side wall of the slope precipitation cavity and is communicated with the water discharging pipe, a sludge hopper is arranged at the bottom of the slope precipitation cavity, and a sludge discharging pipe is arranged at the bottom of the sludge hopper. The device for removing the suspended matters in water provided by the utility model can be used for effectively removing the suspended manners in the water and has the advantages of compact structure, high volume processing capacity and saving cost for the purification and recycling of mine water.