Polish rod kinetic energy additive adding device

A polish rod kinetic energy additive adding device is characterized in that a pesticide discharging pipe is connected to the upper portion of a barrel, a pesticide feeding valve ball is placed in a valve cavity in a pesticide feeding valve cover, a sieve plate is installed at the upper end of the pesticide feeding valve cover, a pesticide inlet is installed on the lower portion of the pesticide feeding valve cover, the pesticide feeding valve cover is installed on the lower portion of the barrel, and a piston and a spring are placed in the barrel; the lower end of the sealing seat is seated on the upper end face of a circular bead of the piston, so that the spring generates pretightening force. The sealing piece is installed in the sealing seat. The pressing cap is connected with the upper portion of the sealing seat. The upper portion of the piston is located outside the pressing cap. The medicine outlet valve ball is placed in the medicine outlet valve cover, the medicine outlet is formed in the upper porti