The invention discloses an unsymmetrical loading shallow-buried tunnel port construction protection structure and a construction method thereof, and belongs to the field of tunnel construction. The invention aims at achieving zero excavation before a port is temporarily supported to avoid the disturbance of slope leveling to a massif. The unsymmetrical loading shallow-buried tunnel port construction protection structure comprises protecting arches, a gravity-type retaining wall and a pipe shed, wherein the protecting arches, the gravity-type retaining wall and the pipe shed are arranged at theouter side of the massif, and the gravity-type retaining wall is connected with the outer sides of shallow-buried side arch springing parts and fits the shallow-buried side arch springing parts. Theconstruction method of the unsymmetrical pressure shallow-buried tunnel port construction protection structure comprises the steps of conducting side slope preprocessing, construction of an arch top section, construction of the pipe shed, construction of the shallow-buried side arch springing parts, construction of the gravity-type retaining wall, construction of deep-buried side arch springing parts and backfilling. Before the arch top section is constructed and when the arch top section is installed, the massif does not need to excavated; when the shallow-buried side arch springing parts andthe deep-buried side arch springing parts are installed, excavating is conducted only at the arch springing parts, and the disturbance to the massif during port protection is reduced. Through the arrangement of the gravity-type retaining wall for resisting unsymmetrical loading of the massif, the excavation amount is small, the disturbance to the massif is small, the construction is convenient, the construction sequence can timely obtain the effect of resisting unsymmetrical loading of the massif, and the obtaining period of the effect of resisting unsymmetrical loading is short.