Drainage system of sunken museum

The utility model relates to a sinking type museum drainage system which comprises a foundation pit, a plurality of parallel flow guide grooves are formed in the side walls of the periphery of the foundation pit from top to bottom, the flow guide grooves incline from top to bottom relative to the horizontal direction, and the flow guide grooves in the side walls of the periphery incline in the same direction. The flow guide grooves in every two adjacent side walls are arranged in the mode that the low-position drainage port of one side wall flow guide groove is communicated with the water inlet of the adjacent side wall flow guide groove, and the water ports of the flow guide groove rows and the water inlets of the adjacent side wall flow guide grooves are located at the same height. According to the method, the drainage ports of the diversion trenches on the same side wall are respectively communicated with the water inlets of the diversion trenches on the adjacent side wall to form an annular water tank; wh