The invention provides an anti-theft lock coded by a trebling laser characteristic. The anti-theft lock coded by the trebling laser characteristic comprises a key, a lock cylinder and a locking head,wherein the key is provided with a power supply, a coding chip, a pulse amplifying circuit and a laser diode, and is used for producing a group of light pulse keying sequence with the trebling laser characteristic of a starting signal; the lock cylinder is provided with a photodiode, a pulse preprocessing circuit and a decoding chip, is used for receiving the light pulse keying sequence with the trebling laser characteristic and produced by the key, decoding a digital code by pulse shaping, comparing the decoded digital code with a preset code, outputting an unlocking signal if the decoded digital code is consistent with the preset code, and otherwise, not outputting; the locking head is used for unlocking according to the unlocking signal from the lock cylinder, and is in a locked state when no unlocking signal exists; the lock cylinder is not provided with a power supply, so that power required for unlocking comes from the key. Compared with a traditional anti-theft lock, the anti-theft lock coded by the trebling laser characteristic, provided by the invention, has high safety and non-replicability.