A Chinese medicinal herb crushing device comprises a base, an outer frame body device, a crushing device body, an inner frame body device, a rotating device and an air inlet device, wherein a first supporting column is arranged above the base; the outer frame body device comprises an outer frame body, a first positioning rod, a first positioning block and a second positioning block; the crushing device comprises a first bracket, a first motor, a first rotating shaft, connecting wires, crushing blades and a supporting shaft; the inner frame body device comprises an inner frame body, an inclined plate, a first through hole, a filter screen, a connecting channel and a convex ring; the rotating device comprises a second motor and a second rotating shaft; the second positioning block is circular-ring-shaped; an annular groove is formed in the upper surface of the second positioning block; the convex ring is circular-ring-shaped; the upper surface of the convex ring is fixedly connected with the lower surface of the inner frame body; the convex ring is accommodated in the annular groove. According to the Chinese medicinal herb crushing device, a better thermal insulation effect is achieved, operating personnel is prevented from being scalded, and the Chinese medicinal herb can be more uniformly crushed since multiple-blade design is adopted.