Paint mixing tank observation opening facilitating feeding

The paint mixing tank observation opening comprises a supporting plate, a stand column and a mixing tank, the mixing tank is arranged above the supporting plate, a feeding and discharging opening is formed in the top face of the mixing tank, the surface of the feeding and discharging opening is in threaded connection with a top cover, and the observation opening is fixedly formed in the surface of the top cover. And a sieve plate is arranged on the inner wall of the material inlet/outlet. According to the paint mixing device, the top cover in threaded connection with the feeding and discharging opening is taken down, the observation opening and the feeding and discharging opening can be separated conveniently, feeding is facilitated, a worker can clean raw materials on the inner wall of the observation opening conveniently after paint mixing, impurities in the raw materials can be filtered out through the sieve plate, and the working efficiency is improved. A worker loosens a fastening bolt to separate the si