Mortar cushion layer reinforcement device

A mortar cushion layer reinforcement device comprises two semi-circular steel pieces fixed to a concrete foundation, the two semi-circular steel pieces are connected into an annular shape through fastening bolts, the annular shape is used for being filled with stirred pre-shrinkage mortar, and two plugging pieces are arranged at the positions, close to the connection portions of the fastening bolts, on the inner sides of the two semi-circular steel pieces. According to the mortar cushion layer reinforcement device, confining pressure is applied to the periphery of a mortar layer, so that compressive strength of a mortar body is improved, and structure safety is guaranteed.