The invention discloses a manual grinding dust removing device for manual grinding process on the wall surface and the roof surface of a room, which comprises: an abrasive paper bracket, a motor, a hose and a dust collecting device. A device for fixing the abrasive paper is arranged respectively at the front and the back of the front side of the bottom board of the abrasive paper bracket; an abrasive paper installing groove whose front side and the bottom are communicated with each other is arranged respectively beside the device for fixing the abrasive paper; the bottom of the bottom board of the abrasive paper bracket is provided with soft material; an air inlet device is arranged at the bottom of the bottom board; an air duct is arranged inside the abrasive paper bracket; a hose connecting device adapted with the section of one end of the hose is arranged on the abrasive paper bracket; the motor is provided with fan leaves which are provided with a fan leaf hood; one or more than one hose connecting devices which are adapted with the section of the other end of the hose are arranged on the fan leaf hood; the hose connecting device on the abrasive paper bracket is connected withthe hose connecting device on the fan leaf hood through the hose; an air outlet device is arranged on the fan leaf hood; the dust collecting device is provided with an opening which is adapted with the section of the air outlet device and is connected with the air outlet device.