The invention discloses a solid material feeding device which comprises a closed tank, a material outlet, a material inlet and an exhaust hole, wherein the material outlet is formed in the bottom of the tank and is communicated with a feeding hole of a target container; the material inlet is formed in the tank and is communicated with a solid material; the exhaust hole is formed in the tank and is connected with a vacuum pump. When the solid material feeding device works, the material outlet is closed, the material inlet and the exhaust hole are opened, the vacuum pump is started, negative pressure is formed in the tank by the vacuum pump, the material is sucked into the tank through the material inlet under the action of the negative pressure and falls onto the bottom of the tank, the vacuum pump is stopped after the material is sucked, the material outlet is opened, and the material at the bottom of the tank enters the target container through the material outlet, so that the solid material feeding can be completed. The direct manual feeding operation is replaced by the whole feeding process, and feeding is realized by adsorption through the vacuum principle; the solid material feeding device is simple to operate, and the adverse effects for the human health and the surrounding environment can be avoided.