The invention discloses a self-sliding detent-type buffer backstop for a belt conveyor. The self-sliding detent-type buffer backstop for the belt conveyor includes a backstop seat and a backstop wheelfixed on a rotating shaft of the belt conveyor, wherein the backstop seat includes a fixing seat; the fixing seat is provided with a backstop slot arranged obliquely; the end, toward down, of the backstop slot extends into the fixing seat; the end, toward up, of the backstop slot extends to the surface of the fixing seat; the end, on the surface of the fixing seat, of the backstop slot is provided with a storage surface; a backstop shaft is disposed on the storage surface; a driving lever fixed on the fixing seat is arranged below the backstop shaft; one end of the driving lever extends intothe lower side of the backstop shaft; the other end of the driving lever extends into the backstop slot; and the driving lever in the backstop slot can make contact with the backstop wheel. The self-sliding detent-type belt conveyor buffer backstopper has the advantages that the backstop wheel is directly fixed on the rotating shaft of the belt conveyor, and the belt conveyor can be backstopped directly; tedious backstop processes through multi stage transmission are avoided; accident rates in midst links are lowered; the efficiency of backstop is improved; and the safety of the backstopper isalso improved.