Drilling tool for complex stratum drilling sampling

The invention relates to the technical field of drilling sampling, in particular to a drilling tool for complex stratum drilling sampling. Comprising a fixing plate, a through groove is formed in the fixing plate, a portal frame is arranged on the upper face of the fixing plate, sliding rails are arranged on the two sides of the interior of the portal frame, clamping grooves are movably clamped in the two sliding rails, a connecting plate is arranged on one sides of the two clamping grooves, and the two clamping grooves are connected through the connecting plate; an adjusting rod is arranged in the center of the upward face of the connecting plate, racks are arranged on one side of the adjusting rod, a motor is arranged at the top end of the inner side of the portal frame, a gear is arranged at one end of the motor, one side of the gear is meshed with the multiple racks, drilling equipment is arranged on the downward face of the connecting plate, and a drill bit is arranged at the bottom end of the drilling e