During rockshaft equipment construction of mine vertical pit, to precisely install cage guide beams, cage guides and the like, a plurality of jug lines conforming to dimension stipulated by construction measures are required to be descended from the ground to rockshaft end opening before construction, and fixed firmly at the end opening to be as vertical reference positioning lines for installation of rockshaft equipment. A steel saw is adopted to saw notches on four steel tubes at the position corresponding to the jug lines according to the diameter of the jug lines to be as the positioning dimension and relative position for fixing two adjacent jug lines, and two ends of each steel tube stretch out of the fixing line. A construct can fix the four jug lines two by two with notch-sawed steel tubes near the line stabilizing beam in the pit to lead the four jug lines to form an integral square frame. The square frame can only sway as an integral in the process of line stabilizing without appearing any single jug line swaying solely. The relative dimension of the four jug lines is absolutely correct, after the jug line square frame stabilizes in the pit shaft, the operating personnel can fix the jug lines on the line stabilizing beam in the pit with a jug line fixing clip.