Abstract: The present invention relates to a chemical tank comprising a tank body and a tank mouth. The tank body includes a tank body part, a tank top and a tank bottom. The tank mouth arranged on the tank top includes a mouth body and a joint part. A stamping fastening structure for connecting the joint part and the tank body is arranged therebetween. Further, a positioning structure is disposed at the junction of the joint part and the tank body. A pressure-proof protective structure located in the joint part and the tank top is provided on the periphery of the stamping fastening structure. Herein, the positioning structure acts to enhance the positioning effect. Besides, the pressure-proof protective structure plays a role of pressure-proof protection. The tank mouth and the tank top are produced by stamping fastening, thus achieving high production efficiency, low cost and high strength.