Micro-disturbance grouting device for controlling horizontal deformation of subway tunnel and construction method

A micro-disturbance grouting device for controlling horizontal deformation of a subway tunnel is arranged between the subway tunnel and a foundation pit and comprises a high-pressure jet grouting pile machine, a jet pipe vertically extending downwards to the surface of a soil body is installed on the high-pressure jet grouting pile machine, and the jet pipe is used for grouting after drilling; a plurality of auxiliary injection pipes which vertically and downwards extend to the surface of the soil body are arranged on the periphery of the injection pipe in the circumferential direction, and the auxiliary injection pipes are used for drilling to release stress or compensating grouting after drilling; a telescopic hydraulic rod is arranged between the auxiliary injection pipe and the injection pipe, a base of the telescopic hydraulic rod is connected with the injection pipe, and the telescopic end of the telescopic hydraulic rod horizontally extends outwards and is connected with the inner side wall of the auxi