The invention discloses a drill bit preventing detritus splashing for mine drilling. The upper and lower end faces of an arc frame are of a semi-circular arc structure. Vertical sliding rails are arranged at the left and right ends of the front face of the arc frame. The vertical sliding rails are slidably connected with T-shaped sliding blocks located on the back face of moving blocks. The innerside surfaces of the moving blocks are integrally formed with two ends of a mounting ring by connecting square rods. A drilling machine body is arranged in the mounting ring. A u-shaped pull handle isfixedly arranged at the top of the drilling machine body. The drill bit is arranged at the bottom of the drilling machine body. An upper fixing ring is arranged below the mounting ring and located around the drilling machine body. A nylon shielding cloth is arranged in an annular groove of the bottom of the upper fixing ring in a pasting mode. The edge of the top of the nylon shielding cloth is arranged at the bottom of the annular groove in a pasting mode. The bottom end of the nylon shielding cloth is arranged in an annular groove of the upper surface of a lower fixing ring in a pasting mode. During practical application, the nylon shielding cloth around the drill bit can be used for shielding detritus produced in the drilling process to prevent the detritus from hitting an operator.