Monitoring symbol for foundation pit monitoring

A monitoring symbol for foundation pit monitoring comprises a concrete pedestal, a base, expansion screws, a vertical column, a top cover, a threaded sleeve, an adjusting rod and a prism. The top end of the vertical column is connected with the top cover, the threaded sleeve is welded at the center of the upper end of the top cover, the bottom end of the top cover is connected with the base, uniformly distributed connecting through holes for fixing are formed in the base, the base is connected with the concrete pedestal through the expansion screws, a threaded rod is welded at the lower end of the adjusting rod and screwed in the threaded sleeve, and a sphere is arranged at the upper end of the adjusting rod and coupled with a spherical hole in the prism. When a high-precision total station is used for observation, a construction process is optimized, foundation pit monitoring efficiency and precision are improved, the monitoring symbol can be recycled, production cost is reduced, the height and the direction of the prism can be adjusted by the adjusting rod, and the monitoring symbol is simple and convenient to use and high in universality.