The invention relates to an antitheft tool key lock. The antitheft tool key lock aims at solving the technical problems that in an existing similar product, a pin tumbler, a lock cylinder and a base are not good in structural design, and the twisting force formed between a key and the lock cylinder is small. A base of the tool key lock is internally provided with a lock cylinder. The antitheft tool key lock is mainly characterized in that either or both sides inside the lock cylinder are each provided with a pin tumbler hole; the inner wall of a lock cylinder hole of the base is provided withring grooves; the ring grooves are provided with base pin tumbler grooves; open lock cylinder pin tumbler grooves are formed in the portions, corresponding to the base pin tumbler grooves, of the outer wall of the lock cylinder; a pin tumbler penetrates each pin tumbler hole in the lock cylinder and abuts against a small spring in the corresponding lock cylinder pin tumbler groove; one side of each pin tumbler is provided with two or more protruding wedge heads; the wedge heads of the pin tumblers extend out of the lock cylinder pin tumbler grooves in the lock cylinder and are inserted into the base pin tumbler grooves of the base; the distance between every the wedge heads of every two pin tumblers is smaller than a gap between the ring grooves in the base; the end corner of a lock cylinder skirt, at one side of the lock cylinder, of each wedge head is provided with a square edge groove; the pin tumbler holes of the lock cylinder and the square edge grooves correspond to a cylinder and a square pillar on the end face of one side of a key; and the key is a tool type key.