The utility model discloses a coating mixing device, including the blending bunker, agitator motor is installed at the blending bunker top, and the end connection has the (mixing) shaft that stretches into in the mixed storehouse under agitator motor's the output shaft, is equipped with stirring vane on the (mixing) shaft, installs a plurality of feeding section of thick bamboos that distribute along the annular on the outer wall in mixed storehouse, and the propulsion cylinder is installed to feeding section of thick bamboo end, installs the inlet pipe on the feeding section of thick bamboo lateral wall. The utility model discloses automatic feeding effectively reduces personnel's amount of labour, entire system is airtight, and solvent evaporation is few, improves site environment, batching personnel, artifical cost reduction are saved to the automatic blending, the material carries out the material loading and does not have surplus material to mixing to scribble through the pipe -line transportation after the head mixes, reducing the surplus material of artifical batching, extravagant and danger is useless produces.