Rapid hole-forming rotary excavating device for complex geology

The rapid hole-forming rotary excavating device comprises a supporting platform, a drilling device is movably arranged on the supporting platform in the vertical direction, a sampling barrel is arranged on the drilling device, a sampling opening is formed in the side wall of the sampling barrel, a drill bit is arranged at the lower end of the sampling barrel, and a driving device for driving the drilling device to move is arranged on the supporting platform. The interior of the sampling barrel is hollow, a connecting barrel connected with the top of the drill bit is arranged in the sampling barrel, a sample cavity is formed between the connecting barrel and the sampling barrel, the side wall of the connecting barrel is a double-layer wall, a water passing channel is formed between the double-layer wall, and a plurality of water outlet channels communicated with the water passing channel are formed in the drill bit; a core rod is slidably arranged in the sliding cavity, the upper portion of the core rod is loc