Offshore road network construction method and system

The invention provides an offshore road network construction method and system, and the method comprises the steps of: determining a reference ship trajectory between two ports based on ship trajectory data and port attachment data; acquiring two target trajectory points of which the distance parameters are greater than a target distance threshold; determining that a connecting line between the two target trajectory points passes through a land area, and constructing a target trajectory based on an A * algorithm and the offshore key point grid; extracting a middle trajectory point of the target trajectory, and iteratively using the A * algorithm between the middle trajectory point and the target trajectory point to extract a plurality of middle trajectory points until a connecting line between adjacent trajectory points in the plurality of middle trajectory points and the target trajectory points does not pass through the land area; and obtaining a target ship route based on the reference ship trajectory and