Drilling tool

The invention relates to a drilling tool which comprises a main drill rod (1) and a main drill bit (2), the main drill bit (2) is arranged at one end of the main drill rod (1), the drilling tool further comprises a sampling structure (3), and the sampling structure (3) is arranged at the end, away from the main drill rod (1), of the main drill bit (2). The drilling tool is of a long-step reducing structure, the maximum output cutting stress of the drilling tool in the frozen soil cutting process can be improved, the cutting capacity of the drilling tool is improved, and the drilling tool can drill in the harsh severe working condition. 本发明涉及一种钻具，包括主钻杆(1)和主钻头(2)，所述主钻头(2)设置在所述主钻杆(1)的一端，还包括采样结构(3)，所述采样结构(3)设置在所述主钻头(2)远离所述主钻杆(1)的一端。本发明的钻具采用长阶梯变径构型，可以提高钻具在切削冻土过程中的最大输出切削应力，以提升钻具的切削能力，使得钻具可以钻进较为苛刻的恶劣工况。