Hand-tight drill chuck

The utility model provides a hand-tight drill chuck which comprises a rotating sleeve, a drill body, a nut, a clamping jaw, a gasket, a sliding assisting assembly and a stop component, the nut is in threaded connection with the clamping jaw, the rotating sleeve is connected with the nut directly or through a connecting structure, the nut is sleeved outside a cylinder of the drill body, and the drill body is provided with a nut supporting structure behind the nut. The nut supporting structure comprises the gasket, and the sliding assisting assembly is arranged between the nut and the gasket. According to the sliding assisting assembly expanding outwards, the locking part on the locking element which does not need to be fixed at the initial time is combined with the rotating sleeve, the effect that the nut is positioned and locked relative to the drill body is achieved, the effects of resisting high inertia and preventing looseness are achieved on the drill chuck, the structure is simpler, and when the drill ch