The invention discloses a hose clamp capable of being quickly locked. The hose clamp comprises a support, a screw and a strap. A cavity is arranged on the support, the screw is mounted in the cavity, a fixed end of the strap is fixedly connected with the support, a movable end of the strap and the fixed end of the strap are enclosed to form a ring and then penetrate out of the cavity, a plurality of slots meshed with the screw in a locking state are arranged on the strap, the screw comprises a screw head, screw necks, threads and a screw tail, the screw necks are respectively positioned among the screw head and the threads and among the screw tail and the threads, and sections of the two screw necks are gradually reduced axially. In a pre-locking state, the small sections of the screw necks are in contact with the support, a fit clearance is increased, the screw is completely prevented from being in contact with the strap, accordingly, the strap can move freely, and in other words, quick action can be implemented; and in the locking state, the large sections of the screw necks are in contact with the support, the fit clearance is reduced, the screw is meshed with the strap, and the hose clamp can be normally locked.