The invention discloses a window regulator with an adjustable buffering block. A motor support of a motor is connected with an installing plate, a reel is installed on one side of the installing platethrough a reel rotating shaft, a guide rail support is arranged on one side of the motor support, a regulator upper fixing screw is arranged on the upper portion of the guide rail support, a regulator lower fixing screw is arranged on the lower portion of the guide rail support, a guide rail is arranged on the guide rail support, an upper guiding wheel is installed on one side of the upper end ofthe guide rail support, a lower guiding wheel is installed on one side of the lower end of the guide rail support, a sliding block is arranged on the guide rail on the guide rail support, a bottom dead center fixing support is arranged on one side of the lower guiding wheel, the bottom end of the adjustable buffering block is inserted into a fixing rack of the bottom dead center fixing support and fixed through a locking nut and an adjusting nut, the sliding block moves to the lower portion and then presses the adjustable buffering block, and an upper steel wire rope and a lower steel wire rope are wound around the reel separately and penetrate through the upper guiding wheel and the lower guiding wheel respectively to be connected with the sliding block. The problem is solved that a buffering block is easily abraded; the adjustable buffering block can effectively compensate for the abrasion of the buffering block.