Pile tip stress testing device

The invention relates to the field of pile foundation detection, and particularly discloses a pile tip stress testing device which comprises an annular mounting frame, a first soil pressure box, a plurality of second soil pressure boxes and a plurality of fixing pieces. A cross-shaped first connecting frame is arranged on the first soil pressure box, and a cross-shaped second connecting frame is arranged on the second soil pressure box; the first soil pressure box is arranged at the circle center of the mounting frame, the second soil pressure boxes are arranged on extension lines of the firstconnecting frame respectively, and the first connecting frame is connected with the mounting frame through the second connecting frame; and the mounting frame is mounted on the reinforcement cage through a fixing piece. By arranging the mounting frame, the cross-shaped connecting frame, the center of the first soil pressure box and the arrangement of the second soil pressure box on each extensionline of the first connect