The invention discloses a rock stratum perforating device for deep hole blasting, and relates to the technical field of rock stratum perforating, the rock stratum perforating device comprises a base, a positioning frame and a perforating mechanism, and the perforating mechanism comprises a supporting frame, a drilling assembly, a driving assembly, a rotating frame, a first rack, a positioning assembly and a displacement assembly; a positioning frame is fixedly installed on the base, and the inner side of the positioning frame is rotationally connected with the supporting frame. A drilling assembly and a driving assembly are mounted on the supporting frame, so that drilling operation can be conveniently performed on a rock stratum, and gravel generated by drilling can be conveniently discharged; a rotating frame and a first rack are fixedly mounted on one side of the supporting frame, rotation along with the supporting frame is facilitated, and adjustment of the drilling angle is achieved; a displacement assembly and a positioning assembly are further installed on the base, when the positioning assembly is connected with the first rack, the drilling angle can be conveniently fixed, the displacement assembly can control the positioning assembly and the first rack to be connected and separated, the drilling angle can be conveniently adjusted and fixed, and rock stratum drilling operation is convenient.