The invention provides a split bolt casing pipe device for building. The split bolt casing pipe device comprises a casing pipe, end bolts, supporting pieces, springs and sealing rings. The end bolts are screwed at the two ends of the casing pipe through threads, the supporting pieces are further fixed at the two ends of the casing pipe, sealing grooves are formed between the supporting pieces and the casing pipe, and the springs and the sealing rings are arranged in the sealing grooves. The split bolt casing pipe device has the beneficial effects that the structure is simple, using is convenient, formwork positioning is precise, and the thickness of a steel bar protecting layer in the construction process can be effectively controlled. The end bolts can be directly taken out after concrete pouring construction is completed, gas-welding cutting is not needed, labor and working hours are saved, and the end bolts can be repeatedly used, so that materials are saved. The casing pipe is adjustable in length and suitable for pouring of concrete structures with various thicknesses. In addition, sealing slurry-leakage-preventing structures are arranged at the ends, in contact with boards, of the supporting pieces, on the one hand, the situation that the end bolts are bonded and fixed by leaking slurry and cannot be easily taken out is avoided, and on the other hand, the wall surface quality can be guaranteed.