Skylight of foundation pit trestle

The utility model discloses a skylight of a foundation pit trestle. The skylight comprises a square skylight opening arranged in the surface of the trestle; a staggering platform is arranged at the skylight opening, and four sides of the lower side of the plane of the staggering platform are downwards gradually closed up to form four inclined surfaces. The skylight of the foundation pit trestle further comprises an opening sealing structure which is lapped with the staggering platform; the opening sealing structure comprises a plurality of strip-shaped supporting blocks; inclined surfaces with the same angle as the inclined surfaces of the skylight opening are arranged at two ends of the supporting blocks; the planes of the side surfaces of all the supporting blocks are connected to the same straight line, and at least one cylindrical surface of which the axis is the straight line passes through all supporting blocks, so as to form a substantial arch-shaped structure by all the supporting blocks. The skylight of the foundation pit trestle has the beneficial effects that the structure is simple, and the design is reasonable; soil can be output at fixed points on the trestle through a crane or a long-arm excavator after arranging the skylight in the trestle, and therefore, the quantity of used small excavators can be decreased, and as a result, the earthwork excavation cost can be reduced; in addition, the excavation is smooth, and thus the earthwork excavation construction is sped up.