The invention relates to an antitheft hub, and specifically relates to a bicycle antitheft hub comprising an axle, a left hub housing, a right hub housing, an annular hub housing, a left spokes disc, a right spokes disc, ball bearings, a generator, a lithium battery and an antitheft lock; the left and right hub housings are arranged on the axle through ball bearings on the two sides; the left hub housing, the right hub housing and the annular hub housing can form a cavity with a regular space; the generator and the antitheft lock are arranged in the cavity; a stator of the generator is arranged and fixed on the axle; a rotor of the generator is embedded on the left hub; when the hub rotates, the electric energy formed by the generator can be continuously stored in the lithium battery; the antitheft lock mainly comprises a lock pin, a cam mechanism, a pressure spring and a motor; the motor drive the cam to rotate according to a control order; the lock pin inserts a groove of the annular hub housing so as to limit the annular hub housing from rotating against the axle, thus locking the bicycle hub, and improving the antitheft power of the parked bicycle.