The invention relates to a rock wall beam oblique surface smooth blasting punching guiding and positioning device which is characterized in that the lower part of a guiding and positioning pipe is connected with rack bodies which are arranged symmetrically, can move and extend up and down; each rack body comprises a channel steel horizontal rack, an extendable longitudinal support rod and a longitudinal fixed support; the longitudinal support rods are vertically connected with the channel steel horizontal racks; and the longitudinal fixed supports are connected with the longitudinal support rods and the channel steel horizontal racks. The longitudinal support rod comprises a No. 1 vertical guiding sleeve, a No. 2 vertical guiding sleeve, a No. 3 vertical guiding sleeve, vertical sleeve fixing screw caps , screw rods and cross-shaped buckles; the No. 1 vertical guiding sleeve, the No. 2 vertical guiding sleeve and the No. 3 vertical guiding sleeve are sequentially sleeved; screw caps are welded in the top ends of the sleeves; the screw caps are connected with telescopic screw rods; and the top ends of the screw rods are welded with the cross-shaped buckles. Compared with the prior art, the rock wall beam oblique surface smooth blasting punching guiding and positioning device has the characteristics of reasonable design, convenience in use, higher working efficiency, lower cost and the like.