A movable oblique cushion block buffer device comprises a base, a hydraulic cylinder, guide rods, a rubber pad, an oblique cushion block, a pin, a slider and a rubber plate. The tail of the hydraulic cylinder is hinged to the base, the head of the hydraulic cylinder is hinged with the slider, four round steel shafts are welded at the bottom of the slider, the guide rods are mounted above the base and on two sides of the slider, the rubber pad and the oblique cushion block are sequentially arranged in a fixing groove on the upper portion of the slider, the oblique cushion block is connected with the slider through the pin, the slider is provided with elongated holes, and the rubber plate is padded between the base and a foundation. The movable oblique cushion block buffer device has the advantages that the oblique cushion block enables an overturned billet to fall on the oblique block firstly and then to be slowly placed on a roller way by moving the oblique cushion block, so that impact damage to the roller way is avoided, shutdown for overhaul is avoided, time, labor and money are saved, and normal production order is ensured.