A faucet mounting structure includes a pipe connector and a fixing assembly in cooperation with the pipe connector. The fixing assembly includes an upper main body and a lower main body. A first inclined surface of the upper main body and a second inclined surfaces of the lower main body are pressed against each other or separated from each other, so that a press ring of the lower main body is compressed or returned for engaging with or disengaging from an external thread of the pipe connector to realize the quick assembly and disassembly of the pipe connector and the fixing assembly, and the quick assembly and disassembly of the faucet body is realized.