Steam cleaning appliance comprising a carter (10) housing a steam-generating device (1), and supply means for the steam thus generated, said means comprising: a supply mouth of the steam-generating device (1) communicating with a supply nozzle (2), which can be coupled with steam supply tools (3, 4), said mouth and said nozzle (2) being connected by means of two pipes (301, 311, 122, 501, 521, 112), a first pipe (501, 521, 112) being provided with shut off means (411) for the steam flow arranged directly downstream from said mouth (101), and equipped with control means (13) which can be operated manually, and a second pipe (301, 311, 122) being provided with shut off means (402) for the steam flow arranged directly upstream from said nozzle (2), opening means (163) being provided for said shut off means (402), which can be operated by coupling said nozzle (2) with a given steam supply tool (3), said tool being provided with steam supply control means (213).