Novel aged wharf upgrading and reinforcing method

The invention provides a novel aged wharf upgrading and reinforcing method and an upgraded and reinforced wharf. A support pile is arranged beneath a lower crossbeam, two sides of the lower crossbeam are provided with insert holes, one ends of hoops in pairwise are inserted into the insert holes, and the other ends of the hoops are arranged below the lower crossbeam. The hoops of each pair are connected beneath the lower crossbeam respectively; rebars are usually arranged between the hoops and the lower surface of the lower crossbeam. A concrete layer is additionally arranged and at least arranged on the surface of a part of the lower crossbeam and wraps the hoops and the rebars. A thin jetting concrete structure (containing rebars) wraps the lower surface of the lower crossbeam, safety and durability of the structure can be enhanced, and collision resistance and seismic resistance are improved. In this case, berthing capacity of the wharf is greatly improved.