Locking drill bit

The invention relates to the field of mining equipment, in particular to a locking drill bit. According to the locking drill bit, a locking structure is additionally arranged at the joint of a drill bit body and a sleeve and can adjust the fixing state of the drill bit body according to the stress condition of the drill bit body so that the situation that the drill bit body is rapidly abraded or a drilling blade is broken due to violent use can be avoided. The locking drill bit is simple in structure and convenient to produce and use; a drill bit locking component is provided, so that the connection fixing performance of the drill bit body and the sleeve is improved; the situation that the drill bit body is rapidly abraded or the drilling blade is broken due to violent use is avoided; and the service life of the drill bit is prolonged and cost is reduced.