The utility model discloses a drill bit protector of colliery entry driving machine, including a support arm section of thick bamboo, the interior rampart swing joint of a support arm section of thickbamboo has rotating shaft rod, and rotating shaft rod's side surface screw has cup jointed the first spacing lantern ring of interior rampart fixedly connected with of drill bit, drill bit. It is rotatory through utilizing first slide bar to be ordered about spiral shell rasp bar by extruded while rack belt moving gear, make screw sleeve downwards and to insert the bolt downthehole, thereby the first fixed lantern ring is spacing fixed with a support arm section of thick bamboo, and second stop collar ring sum nut carries out distance to the fixed lantern ring of first fixed set ring sum second and spacing and fix, it is tight when spacing to first stop collar ring grip that the messenger wins the fixed lantern ring of fixed cover ring sum second, the first spacing lantern ring can rotate, then the high -speed rotatory during operation of drill bit, receive the first spacing lantern ring, the spacing of the lantern ring is fixed to fixed set first ring sum second, protect with rotating shaft rod the drill bit, the not hard up situation that breaks away from has been avoided appearing between drill bit and the rotating shaft rod.