Vacuum mechanical automatic material mixing device

The utility model belongs to the technical field of material mixing, and particularly relates to a vacuum mechanical automatic material mixing device which comprises a mixing tank, a feeding cylinder and a discharging pipe, the feeding cylinder and the discharging pipe are respectively communicated with one side of the top of the mixing tank and the center of the bottom of the mixing tank, and the top end of the feeding cylinder is movably clamped with a sealing cover through a buckle. The top of the sealing cover is connected with a vacuum machine through a gas guide pipe, the vacuum machine is mounted on one side of the top of the mixing tank, a mixing and stirring mechanism is arranged in the mixing tank, and a spraying mechanism is further arranged at the top of an inner cavity of the mixing tank; by means of the mixing and stirring mechanism, materials in the mixing tank can be pushed upwards and downwards to be mixed, all the materials in the mixing tank are fully stirred, the materials are mixed more e