The invention discloses an anti-theft magnetic control lock cylinder which comprises a key unlocking body and a lock cylinder body. The key unlocking body comprises a rear baffle ring, a rear lock sleeve, a lock knob, a plurality of magnetic guide balls, a shifting block, a ejector shaft, a transmission piece and a front baffle ring, wherein the rear baffle ring, the lock knob, the shifting block, the ejector shaft, the transmission piece and the front baffle ring are arranged in an axial through hole of the rear lock sleeve from back to front in sequence, the lock knob is rotatably arranged at a fixed axial position, the shifting block is matched in a shifting block containing groove in the front end of the lock knob and can be matched with the transmission piece in a drivable mode when moving forward, the transmission piece is arranged in and butts against the front baffle ring in a penetrating mode, the front end of the transmission piece stretches forwards out of the axial through hole of the rear lock sleeve, a ejector shaft containing cavity is formed in the rear end of the transmission shaft, and the ejector shaft is arranged in the ejector shaft containing cavity in an axial movable mode and flexibly butts against the lock knob and the front end face of the shifting block. The lock cylinder body comprises a lock tongue, and the front end of the transmission piece is in drivable matching with the lock tongue. The anti-theft magnetic control lock cylinder has the advantages that the key unlocking body and the lock cylinder body are of a split type structure, and the lock cylinder can be matched with anti-theft locks of different thicknesses.