The invention discloses a device and method for utilizing bearing force of soil between cast-in-place piles. The device comprises a steel end plate, a first XPS plate, a second XPS plate, cast-in-place pile main ribs and cast-in-place pile annular bearing rods. The steel end plate is a circular plate with an annular groove in a circular ring shape. A plurality of connection blocks are arranged in the circular-ring-shaped annular groove so that the portions, located inside and outside the circular-ring-shaped annular groove, of the steel end plate can be connected into a whole. The first XPS plate is an annular plate, wherein the size of the first XPS plate is the same as that of the portion, located outside the annular groove, of the steel end plate. The second XPS plate is a circular plate, wherein the size of the second XPS plate is the same as that of the portion, located inside the annular groove, of the steel end plate. The first XPS plate and the second XPS plate are located at the upper end of the steel end plate which is arranged at the upper end of a PHC pipe pile. The cast-in-place pile main ribs extend out of the annular groove of the steel end plate, an annular groove of the first XPS plate and an annular groove of the second XPS plate along circumferences and extend upwards into a bearing platform or a raft. By means of the device and method, the bearing force of the soil between the cast-in-place piles is brought into full play and fully utilized; burdens on foundation piles can be reduced; the manufacturing cost can be reduced; and the economical efficiency can be increased.