Device for measuring sediment thickness through drill bit variable pressure sensing method

The invention relates to a device for measuring the sediment thickness through a drill bit variable pressure sensing method. The device comprises an upper cover plate. A plurality of protection frames are perpendicularly arranged on the upper cover plate, a pressure sensing propelling device perpendicular to the upper cover plate is arranged on a propelling device fixing seat and connected with a control terminal, a push rod of the pressure sensing propelling device faces the upper cover plate, and a sweeping motor connected with the control terminal is arranged between the push rod and the upper cover plate. A sweeping drill bit is arranged on the sweeping motor and penetrates through the upper cover plate. In the working process, the upper cover plate is static on the upper surface of sediment, the sweeping motor is started first, then the pressure sensing propelling device is started, the motor perpendicularly moves downwards to the bottom of a hole under the action of the pressure sensing propelling device, a certain numerical value is achieved through a real-time pressure sensor (manual calibration), the pressure sensing propelling device stops working, and the advancing distance of the push rod is the sediment thickness.