A lockset for tool case belongs to the technical field of hardware manufacture and comprises a lock shell, a lock cylinder body, a spring, a push plate, a lock hook plate and a torsion spring, whereinthe middle of the lock shell is provided with a lock cylinder hole, the front end thereof a panel and the back end thereof a lock hook plate bracket, the hole wall of the lock cylinder hole is provided with a lock tongue slot, and the bottom of the lock cylinder hole is provided with a supporting seat and a lock cylinder positioning lug; the lock cylinder body is arranged in the lock cylinder hole, the middle of the front end of the lock cylinder body is provided with a lock cylinder and a lock tongue and the back end thereof is provided with a spring seat, a slide slot is arranged on the spring seat, and the tail of the spring seat is provided with a square head; the spring is sheathed at the spring seat of the lock cylinder body and is contacted and matched with the supporting seat; thepush plate is fixed on the square head; the lock hook plate is pivoted on the lock hook plate bracket and provided with a push pin and a lock hook pin; and the torsion spring is mounted on a pin shaft, a first torsion spring pin of the torsion spring is fixed with the lock hook plate and the second first torsion spring pin thereof is fixed with the lock hook plate bracket. The invention has the advantages of good concealment, outstanding anti-pry and anti-theft performance, good self-locking function, long service life, labor-saving and convenient operation, simple structure and good closeness effect.