The invention discloses a hot mine crushing device capable of realizing automatic detection. The hot mine crushing device comprises a crushing machine body, a crushing shaft is arranged in the crushing machine body, the crushing shaft is driven by a driving motor arranged outside the crushing machine body, and the crushing shaft is provided with a plurality of crushing end teeth radially extending along the crushing shaft; a detecting end body adopting an annular structure is arranged outside the crushing machine body, a plurality of thickness measuring instruments are arranged on the inner wall of the detecting end body, a plurality of connecting rod pieces extending in a vertical direction are connected on a bottom end surface of the detecting end body, and each connecting rod piece is connected to a lifting cylinder. By adopting the hot mine crushing device capable of realizing automatic detection in the technical solution above, a wall thickness of the crushing machine body can be detected by the thickness measuring instruments arranged outside the crushing machine body, such that the wall thickness of the crushing machine body is detected in real time to precisely know an internal wearing condition, and the device can be overhauled as soon as possible under a necessary condition.