A shell deviation rectifying system is applied to shell deviation of a bucket elevator and comprises an external shell, a lower section, a chain bucket assembly, an upper section and a driving device. The upper section and the lower section are provided with an upper fixing frame and a lower fixing frame respectively. A central deviation rectifying pipe is arranged between the upper fixing frame and the lower fixing frame. The upper fixing frame and the lower fixing frame are fixed to the external shell. The shell deviation rectifying system has the beneficial effects that because the central deviation rectifying pipe has the function of supporting the whole chain bucket assembly, the chain bucket assembly is prevented from inclining towards one side, and shell deviation is avoided.