Recycled concrete contractility testing device

The utility model discloses a recycled concrete contractility testing device which comprises a bottom plate and a top plate, four supporting columns are vertically and fixedly connected between the bottom plate and the top plate, an air cylinder is arranged at the bottom of the top plate, a heater body is arranged at the output end of the air cylinder, a first fixing base is vertically and fixedly connected to the left side of the top of the bottom plate, and a second fixing base is vertically and fixedly connected to the right side of the top of the top plate. The right side of the top of the bottom plate is connected with a second fixing seat in a sliding mode. According to the recycled concrete contractility testing device, a concrete block is placed above a supporting frame from front to back, one side of the concrete block abuts against a first fixing base, a positioning block positions the concrete block, and the other side of the concrete block makes contact with a moving plate, so that a feeler lever