Liquid pesticide preparation tank with automatic proportioning structure

The utility model discloses a liquid pesticide preparation tank with an automatic proportioning structure, which comprises a quantifying tank, a pneumatic proportioning bag, a motor, a preparation tank and a stirring frame, the stirring frame is arranged in the preparation tank, four quantifying cylinders are arranged on the stirring frame, the top of the stirring frame is connected with a connector, the connector is arranged at the end part of a connecting shaft, and the connecting shaft is connected with the pneumatic proportioning bag. The connecting shaft is connected with an output shaft of a motor, the motor is arranged in the middle of the top end of the preparation tank through a motor base, a plug is arranged at the bottom end of the pneumatic proportioning bag, the plug is fixedly inserted into a feeding port in one side of the top of the motor base, a quantitative guide pipe is arranged at the bottom end of the quantitative tank, and an electromagnetic valve is arranged on the quantitative guide pi