The invention discloses a pin tumbler lock and a key thereof. The pin tumbler lock comprises a lock body, a lock cylinder, an inner pin, an outer pin and a spring, wherein the lock cylinder is locatedin the middle of the lock body and can rotate, and the spring is used for supporting the outer pin. The lock cylinder includes a keyhole. The inner pin, the outer pin and the spring are all arrangedin the lock body. The keyhole is formed in the one side of the inner pin, and the outer pin is connected with the other side of the inner pin. The spring is connected with the other side of the outerpin. The key used for the pin tumbler lock comprises multiple rugged saw teeth and multiple waved profile curves, wherein the saw teeth are in contact with the inner pin, and the profile curves are formed by the saw teeth. The pin tumbler lock and the key thereof can realize convenient management of multi-space security, the management efficiency is improved, and the form of unlocking is achievedthat a key can unlock a lot of locks, and the same lock can be opened by different keys, namely, the design of the key and the lock cylinder is not completely matched in a one-to-one corresponding mode.