At present，the ship shore power technology has been basically popularized and applied in the new wharf，but the early old wharf is generally rarely equipped with ship shore power system. At the same time，due to the lack of corresponding supporting infrastructure during construction，the old wharf does not have the conditions for direct installation of ship shore power equipment. It is urgent to take transformation measures to meet the use demand of the ship shore power. Taking the second international container terminal in Beilun Port area of NingboZhoushan Port as an example，we introduce a reconstruction scheme of ship shore power supporting foundation pit of old high pile beam slab wharf，which is by chiseling off the local panel and side beam bracket of the wharf front and adding facilities such as cover plate stop，closed bottom plate，steel cover plate，fairlead，steel ladder and steel grid plate，so as to meet the installation and use requirements of shore power equipment. This transformation scheme has the advantages of simple structure，convenient construction，little impact on the original structure and strong universality. It can ensure the safety，reliability and convenient operation of shore power supply process when the ship is docked at the wharf.