Bottom mud sampler

The bottom mud sampler comprises a sampling pipe, a supporting seat, a movable rod and a vibration assembly, a cutting tool bit is arranged at the tail end of the sampling pipe, an opening and a rope buckle which are communicated with an inner cavity of the sampling pipe and the outside are arranged on the side wall of the supporting seat, a pneumatic sealing assembly is arranged at the tail end of the movable rod above the cutting tool bit, and the pneumatic sealing assembly is connected with the vibration assembly. The vibration assembly further comprises a vibration hammer and a vibration motor. The bottom mud sampling device has the functions that a collected bottom mud sample is plugged in the sampling pipe from the bottom end of the sampling pipe by adopting the pneumatic sealing assembly, the material leakage condition during piston type sampling is avoided, and meanwhile, the rope fastener is arranged on the side wall of the supporting seat and is connected with a ship cargo boom through the steel rop