The invention relates to a fastener which comprises a fastening frame, an adjusting assembly and an adjusting rod, and the fastening frame comprises fixing rods (22) arranged in parallel; the two adjusting rods which are coaxially arranged are distributed between the fixing rods (22), and the axes of the fixing rods (22) and the axes of the adjusting rods are located on the same plane; the adjusting assembly is arranged at one end adjacent to the adjusting rod; the adjusting assembly comprises an adjusting block (23), a pipe (24) and a fixing piece (26). The fastener overcomes the defects in the prior art, is used for being connected with the crossed diagonal member pull rod on the temporary iron tower of the power transmission line, is reasonable in design and simple in structure, and solves the problems that a screw rod is poor in connection stability, prone to swing, prone to screw thread damage and small in tensile capacity.