Hole bottom sediment thickness measuring device

The utility model discloses a hole bottom sediment thickness measuring device which comprises a reference disc (1) and a measuring assembly (2), a penetrating opening (3) matched with the measuring assembly (2) is formed in the middle of the reference disc (1), a plurality of supporting columns (4) are arranged at the bottom of the reference disc (1), and a measuring rope (5) is arranged on the measuring assembly (2). The device is characterized in that a vertical sliding hole (6) penetrating through the supporting column (4) is formed in the supporting column (4), and an action column (7) which is elastically and movably connected is arranged in the vertical sliding hole (6); a plurality of transverse sliding holes (8) communicated with the vertical sliding holes (6) and the penetrating opening (3) are formed in the reference disc (1), locking columns (9) in elastic sliding connection are arranged in the transverse sliding holes (8), and spherical pressing faces (10) are arranged at the outer ends of the loc