The invention discloses an adjustable treading device convenient for assembly and disassembly, and the device comprises a connecting plate. Two ends of the connecting plate are symmetrically providedwith threaded grooves, and the interiors of the threaded grooves are in threaded connection with screws, wherein the thread directions of the two screws are opposite. The ends, far from the bottoms ofthe threaded grooves, of the threaded rods pass through the mouths of the threaded grooves to extend outwards, and are symmetrically and fixedly connected with first connecting parts with the semicircular cross sections. A second connecting part with the semicircular cross section is rotatingly connected between the two first connecting parts through a screw, and one end, far from the connectingplate, of the second connecting part is fixedly connected with an installation block. A vertical side wall, close to the bottom, of the installation block is symmetrically provided with sliding holes.According to the invention, an inward force is applied to an operating rod, so as to control the clamping fit relation between the limiting groove and the limiting rod. The operating rod cooperates with the first spring and the first sliding block for application, thereby facilitating the disassembly and assembly of the treading device. Meanwhile, the device can be suitable for different types ofbuildings.