Civil engineering foundation pit supporting device

The utility model belongs to the field of civil engineering, and particularly relates to a civil engineering foundation pit supporting device. The utility model provides a civil engineering foundation pit supporting device which is convenient to operate, can prevent soil from falling into a foundation pit, and comprises a Z-shaped plate, an L-shaped net plate, a fixing hook, a limiting strip, a transverse fixing nail and a square plate, one Z-shaped face of the Z-shaped plate is provided with a vertical limiting groove, and the other Z-shaped face of the Z-shaped plate is provided with an L-shaped net plate. The other Z-shaped face of each Z-shaped plate is provided with the vertical limiting strip, and the two Z-shaped plates are connected together through the limiting grooves and the limiting strips. The Z-shaped plate can be stably mounted through the matching of the vertical fixing nails and the transverse fixing nails, so that the Z-shaped plate can stably support the side wall of a foundation pit; and t