The invention discloses a floorboard surface turning structure capable of realizing turning through gear transmission. The floorboard surface turning structure comprises an inner frame, an outer frame, a pedal gear, a screw rod, a vertical rack, a driving gear and a clutch structure, wherein the inner frame is used for rotationally installing the pedal; the outer frame is used for installing the inner frame through a telescopic elastic support leg; the pedal gear is arranged on a pedal rotating shaft; the screw rod is arranged at the inner frame and is engaged with the pedal gear; the vertical rack is arranged at the outer frame; the driving gear is arranged in the inner frame and is engaged with the vertical rack; transmission connection is adopted between the driving gear and the screw rod; the clutch structure is arranged between the pedal rotating shaft and the driving gear; and the clutch structure is used for disconnecting the power transfer between the driving gear and the pedal rotating shaft when the driving gear downwards moves. The floorboard surface turning structure has the advantage that when a person leaves away from a floorboard, the pedal of the floorboard automatically turns the surface.