The utility model discloses a beam -pumping unit self -adaptation formula balance adjustment device, including the compensating beam, the left side one end of compensating beam is provided with the base, and the base passes through the fixed motor of bracing piece, and one side of motor is provided with the detection switch board, detects the switch board and is connected to the motor connector through the cable, and the motor connector sets up the upper end at the motor, compensating beam upper portion is provided with the lead screw rather than the parallel, and it is fixed with the compensating beam that the backup pad is passed through to the right side one end of lead screw, and it is fixed with the lead screw bracing piece that its left end passes through the balanced base of lead screw, and lead screw inside is provided with communication cable, is provided with the balance car on the lead screw. The utility model has the advantages of simple structure, remote automatic control, automatic adjustment balance, labour saving and time saving, reduction staff's intensity of labour, improvement work efficiency.