Balancing pulley for sliding door

The utility model discloses a balance pulley for a sliding door, which comprises a pulley and a motherboard and also comprises a pulley seat, wherein the pulley is arranged at the outer side of a bottom board of the pulley seat and both sides in the pulley seat are respectively provided with a slot. A back bottom board of the pulley seat is provided with a pressure spring seat which is provided with a pressure spring, and the pressure spring is parallel to the slot. The motherboard is provided with a connecting board, both sides of the connecting board are respectively provided with a plug provided with a groove, wherein the section area of the groove is bigger than the sectional area of the pressure spring, the plug of the connecting board is inserted into the slot of the pulley seat and the pressing spring is inserted into the plug groove. The linear sliding door of the utility model is used, the sliding door has 'elasticity' between an upper and a lower pulley orbits under the action of the pressing spring, optimal close effect can be achieved through the 'elasticity', and the door is easy to open and close because friction, uneven orbits and resistance brought by that force is not used uniformly can be overcome lightly.