The invention discloses a tunnel periphery hole blast hole positioning device. The device comprises a double-layer arc-shaped sliding frame, wherein a blast hole positioning sliding groove and a firstangle adjusting sliding groove which are parallel to the tunnel face of a tunnel are formed in the double-layer arc-shaped sliding frame, a sliding component capable of sliding along the blast hole positioning sliding groove is arranged in the blast hole positioning sliding groove, and a sliding component capable of sliding along the first angle adjusting sliding groove is arranged in the first angle adjusting sliding groove; and the sliding components can adjust the inclination angle of a drill rod penetrating through an angle adjusting hole and a positioning hole. According to the tunnel periphery hole blast hole positioning device, the positions of peripheral hole blast holes are positioned by means of sliding of a blast hole positioning sliding plate in the blast hole positioning sliding groove, and the position of the angle adjusting hole is determined by sliding a second angle adjusting sliding plate in a second angle adjusting sliding groove; and the inclination angle of the drill rod is determined through the angle adjusting hole and the positioning hole, and then drilling is conducted, so that the peripheral hole blast holes with the angle meeting the design requirement are obtained, the sampling time of the peripheral holes is saved, and the accuracy of the inclination angle of the blast holes is improved.