Sandpit leveling device

The sandpit leveling device comprises a guide rail and a smoothing structure, a collecting structure is arranged on one side of the guide rail, the collecting structure is connected with the guide rail, a calibration structure is arranged on the side, away from the collecting structure, of the guide rail, and the guide rail is in an inverted trapezoid shape and comprises a short section, a long section, an inclined section and a vertical section; the collecting structure is detachably connected with the vertical section, the short section and the long section are connected through the inclined section and the vertical section, a first electric cylinder is horizontally arranged on the outer side, connected with the vertical section, of the short section, a second electric cylinder is obliquely arranged on the outer side, connected with the inclined section, of the short section, and a third electric cylinder is horizontally arranged on the outer side, connected with the inclined section, of the long section. A