A faucet mounting mechanism includes a faucet body, a pipe joint, a nut, and a fastening seat. A bottom of an inner ring of the nut has a first inclined surface. The fastening seat is mated with the nut. The fastening seat has a second inclined surface. An outer ring of the fastening seat is provided with at least two fastening buckles. The fastening buckles are tightly mated with an inner wall of the nut. Through the cooperation of the nut and the fastening seat, the nut and the pipe joint can be assembled or disassembled quickly.