The utility model provides a balancing unit's technical scheme is transferred to beam -pumping unit elasticity, and this scheme is including balanced support, and the fixing base is installed to the one end of this balance support, the supporting seat is installed to the other end of balanced support, and this supporting seat upper end is fixed with the motor, and this motor is connected with the cylinder, is provided with the connecting block on the connecting rod of this cylinder, installs the balancing weight on this connecting block, install aversion adjustment mechanism on the supporting seat. Through setting up aversion adjustment mechanism, position that can adjust the cylinder can increase balanced control range, improves and adjusts the precision.