A container faucet assembly includes a locking device disposed on a container and having a locking knob. A tubular member has a through-hole, an insertion section, a coupling section, and a front section. The insertion section is coupled with the container. The coupling section includes an outer periphery having at least one guiding groove with a transverse section. A seal is disposed around the front section. The faucet further includes a coupling portion having a coupling hole intercommunicating with an outlet of the faucet. An inner periphery of the coupling hole includes at least one protrusion slidably received in the at least one guiding groove. A radial hole extends through the inner periphery of the coupling hole and intercommunicates with the coupling hole. A locking end of the locking knob extends into the radial hole. A sealing portion is disposed on the inner periphery of the coupling hole.