Convenient-to-assemble and anti-disassembly ball valve with lock

A lock ball valve convenient to assemble and resistant to disassembly comprises a valve body, a valve element, a sealing ring, a valve deck, a valve rod and a key wrench, a rotatable valve cap is arranged on the upper portion of the valve body, a rotation limiting hole is machined in the valve cap and is in linkage with the valve rod, a through hole is further formed in the valve cap in the circumferential direction of the rotation limiting hole, and a pin hole corresponding to the through hole is formed in the valve body. A first limiting structure is arranged between the valve bonnet and the valve body to limit axial movement of the valve bonnet, a second limiting structure is arranged between the valve bonnet and the valve body to limit the rotating angle of the valve bonnet, a cap is buckled to the upper portion of the valve bonnet, a containing cavity used for installing a lock and a spring is formed in the valve bonnet, and the spring is supported between the lock and the cap. The lock comprises a lock