The invention discloses a reactive powder concrete large-eccentric compression member crack load calculation method. The stress distribution of the entire compression zone of a member is triangular similarly; the stress of the RPC concrete in the elastic state is still in the triangular distribution before the compression zone reaches the peak tension strain; according to the RPC concrete in the shaping state adjacent to the member compression zone edge, the stress is simplified to be in triangular distribution that the stress of the compression zone edge to the peak tension strain position is zero;an equilibrium equation is established for solution according to the equilibrium conditions of the section force and section torque; in the crack load calculation, the influence of the additional eccentric distance caused by large-eccentric compression member lateral deformation is considered, and the value is found as 5mm. The reactive powder concrete large-eccentric compression member crack load calculation method can be applied to reactive powder concrete large-eccentric compression member design calculation, the theoretical foundation for the is laid for promotion and application of the reactive powder concrete to eccentric compression members, and huge social and economic benefits are provided.