The invention discloses a ship-shore connection method. The ship-shore connection method comprises the steps of: performing equal-potential detection and ship power grid insulation detection of a shipside and a shore power side; responding to detection pass, performing protection setting value matching of the ship side and the shore power side; responding to protection setting value matching pass, controlling synchronous grid connection and closing; and performing ship load transfer till a ship is completely powered by a power supply of the shore power side. Simultaneously, the invention discloses a corresponding system. When connection is carried out, equal-potential detection, insulation detection and protection setting value matching are carried out; detection and monitoring of a connection process can be realized; when grid connection and closing conditions are satisfied, synchronous grid connection and closing are carried out; and thus, the connection reliability is ensured.