The utility model relates to a directional fracture blasting device for an aqueous medium coupling slit pipe, which can effectively solve the problems that the existing directional fracture blasting device for the air medium coupling slit pipe can cause a gas explosion accident and affects the stability of frozen earth when used. The technical scheme provided to solve the problem is that the directional fracture blasting device for the aqueous medium coupling slit pipe comprises an explosive package and a slit pipe; two symmetrical slits are arranged along the length direction of the slit pipe body; an annular water drum is arranged in the slit pipe; and the explosive package is filled into a cavity body formed by the annular water drum. The directional fracture blasting device for the aqueous medium coupling slit pipe has the advantages of unique structure, safety in use and good effect, and the device is the innovation of the directional fracture blasting device for the coupling slit pipe.