Abstract: The floor heave of the fully mechanized caving roadway not only causes damage to the roadway, but also has an important impact on the stability of the narrow coal pillars, the filling body beside the roadway and the entire roadway. The strong floor heave brings a lot of maintenance and renovation work, which seriously affects the normal operation of the mine. Production greatly increases the support and maintenance costs of the roadway. In this paper, the Winker elastic foundation theory model is used to establish a mechanical model of the floor heave of the roadway along the goaf. Combined with engineering cases, the mechanical model of the floor heave of the roadway is verified. The research results show that the deformation of the solid coal and the side floor of the roadside support is close to zero. The floor deformation of the roadway area presents a "parabolic" characteristic, with non-positive symmetry. The maximum deformation of the floor heave is located near the side of the roadway support body, with a maximum value of 628 mm; the maximum value of the floor heave after 100 days of actual deformation monitoring is 645 mm, the theoretical model The error between the maximum value and the measured maximum value is 2.6%.