The invention provides a paint blending device. The paint blending device solves the problem that the existing stirrer has a simple structure, cannot fast stir paint and has a slow stirring rate. Thepaint blending device comprises a frame, a blending box is fixed to the frame through support legs, the upper part of the blending box is provided with a feeding inlet, a solenoid valve 1 is arrangedat the feeding inlet, the lower part of the blending box is provided with a discharge outlet, a solenoid valve 2 is arranged at the discharge outlet, a vertical main shaft is arranged in the blendingbox, the upper end of the main shaft is connected to the upper end of the blending box through a mounting base 1, the lower end of the main shaft is connected to the lower end of the blending box through a mounting base 2, a stirring blade 1 for moving materials up and a stirring blade 2 for moving materials down are respectively fixed to the middle of the main shaft, the stirring blade 1 is located above the stirring blade 2, the blending box is provided with a power mechanism for rotating the main shaft, and the frame is provided with a pushing mechanism for pushing materials in the blendingbox. The paint blending device can fast blend materials.