The invention discloses an electrode balance adjustment mechanism which is used to adjust an upper electrode in a spot welding machine to ensure that the pressures of all the soldered dots are the same. The electrode balance adjustment mechanism comprises a first supporting seat, a first bearing seat fixedly connected with the first supporting seat, a second supporting seat, a second bearing seat fixedly connected with the second supporting seat and a connection part provided with a first fulcrum shaft and a second fulcrum shaft, wherein the first fulcrum shaft is hinged with the first bearing seat, the second fulcrum shaft is hinged with the second bearing seat; the two supporting seats are both hinged with the fulcrum shafts of the middle connection part through the bearing seats, and the two fulcrum shafts of the connection part are arranged at a certain angle. Therefore, the second supporting seat can rotate a certain angle along the first fulcrum shaft or second fulcrum shaft of the connection part and can also rotate around the two directions of the first fulcrum shaft and the second fulcrum shaft to generate a comprehensive angle combined by two angles, namely the second supporting seat can inclines at a certain angle in any direction to the first supporting seat.