Sampling device for geotechnical investigation and drilling

The utility model relates to the technical field of drilling sampling, in particular to a drilling sampling device for geotechnical investigation. Comprising an outer sleeve body, a plurality of hydraulic rods are arranged in the outer sleeve body, a fixing plate is arranged below the hydraulic rods, a motor is arranged above the fixing plate, an output shaft of the motor is connected with a rotating shaft, a drill bit is arranged below the rotating shaft, a cone is arranged above the drill bit, a wheel is arranged above the cone and located in the fixing plate, a sampling hole is formed in the drill bit, and a sampling plate is arranged in the sampling hole. The sampling plate and the drill bit are connected through a plurality of first springs, a storage disc is arranged above the outer sleeve body, a plurality of storage drawers are arranged in the storage disc, a transparent frame is arranged on one side of each storage drawer, a grabbing rod is arranged above the storage disc, the outer sleeve body is co