The invention relates to a hose connector with an adjusting mechanism, which is used for hermetically connecting a patient interface
assembly and a
machine in
CPAP treatment, and comprises a first connector connected with an external tubular connector, a second connector connected with a hose and a side wall surrounding the first connector and the second connector, the side wall is provided with an inner part and an outer part, and the outer part is provided with an adjusting mechanism. The outer part is provided with a grabbing part; the first connector is configured to be connected with an external tubular connector and comprises a partial side wall of the tubular connector, a cavity for accommodating the external tubular connector, an opening, a stop surface and a retaining structure, and at least one adjusting mechanism is arranged on the opening; the second connector is configured to be connected with a hose; and the first connector of the hose connecting piece with the adjusting mechanism is made of an elastic first material.