The invention discloses a large-span tie bar arch bridge approach bridge jacking system and jacking construction method. The system comprises a left approach bridge main beam jacking device and a right approach bridge main beam jacking device, wherein each of the approach bridge main beam jacking devices comprises an abutment-side hydraulic jacking device and a pier-side hydraulic jacking device,and each of both the abutment-side hydraulic jacking device and the pier-side hydraulic jacking device of each approach bridge main beam jacking device is an approach bridge beam end jacking device; and each of the approach bridge beam end jacking devices comprises a transverse distribution beam, a plurality of vertical jacking devices and a plurality of auxiliary supporting structures. The jacking construction method comprises the following steps of 1, mounting the jacking devices; 2, carrying out jacking; 3, increasing height of an approach bridge lower structure in a jointing way; and 4, removing the jacking devices. The large-span tie bar arch bridge approach bridge jacking system and jacking construction method have the advantages of reasonable structure design, simple and convenientconstruction and good use effect; the two left and right symmetrically-arranged approach bridge main beam jacking devices are adopted to carry out vertical jacking on a to-be-jacked approach bridge main beam, the vertical jacking devices and the auxiliary supporting structures are adopted in each approach bridge main beam jacking device to cooperate together to carry out jacking, and meanwhile theadopted temporary supporting structures have good bearing effect and good supporting stability, thus ensuring that the jacking process of the approach bridge main beam is stable and reliable.