The invention discloses a deep-hole blasting construction technology in fractured rocks. The technology comprises the following steps: firstly finding out information such as joint fracture occurrence in the inner wall of a blasting hole, development degree, space position by utilizing a drilling camera shooting technology; and then carrying out optimization design for blasting parameters, such as explosive load of a blasting hole, explosive load structure, the length of an explosive roll, blasting sequences according to the storage condition of the joint fracture in each blasting hole, thus the aim to improve the blasting effect, reduce the effect of blasting quality by the fracture and reduce the blasting cost is realized. The technology provided by the invention is especially suitable for a medium-deep hole blasting construction technology of soft cracked crocks of joint fracture of underground metal ores, the effect degree for blasting quality by joint fracture of the crocks can be reduced effectively, the damage to surrounding rocks by the blasting shock is reduced, the damage caused by shock waves to surrounding drill holes is reduced, and the blasting cost is saved.