Ultra-deep foundation pit press-grouting pile and prestressed anchor combined supporting construction method

The invention provides an ultra-deep foundation pit press-grouting pile and prestressed anchor combined supporting construction method which comprises the following steps that S110, ground water falling within a construction site is conducted; S120, a long spiral drilling machine conducts press-grouting pile construction; S130, a first earthwork layer is excavated; S140, anchor construction is conducted; S150, concrete is sprayed; S160, a prestressed anchor is tensioned; S170, a second earthwork layer is excavated; and S180, construction flows of Steps S140 to S170 are performed again and sequentially till overall construction of an ultra-deep foundation pit to be constructed is accomplished. A construction period of a construction technology of the method is short; the technology is simple and easy; the operability is high; and the problem of site limitation to the existing urban large building in a construction process can be solved to some extent.