Novel one-piece bicycle anti-theft alarm

The invention discloses a novel one-piece bicycle anti-theft device. A left handle bar and a right handle bar are screwed at the left and right sides of the upper part of a T-shaped structure and clamped and fixed by clamping devices; the lower end of the T-shaped structure is connected with a coded lock head which is fixed on a vehicle tube; the T-shaped structure is connected with a round lock at a front wheel by virtue of a brake cable embedded in the vehicle tube; a small T-shaped structure is of a design for covering the coded lock head after the T-shaped structure is taken away; and the left handle bar and the right handle bar are connected by virtue of a tube of which the upper part is not provided with a transverse protruded main shaft, are loaded on an objective table when in idle, and can rotate along with a bearing. The device is applicable to preventing or limiting a behavior of using a bicycle arbitrarily or stealing the bicycle; a lock supergroup combined with the bicycle into a whole can be app