The invention discloses a method and system for predicting the posture of a ship moored at an open type wharf. The method comprises the following steps of collecting environment dynamic data, wharf ship data and ship gesture data; integrating the three data collected, to form a sample sequence in continuous time, and storing into an environment wharf ship integrated database; collecting current environment dynamic data, and inputting into an environment dynamic prediction model to obtain environment dynamic prediction data at a set time period; the environment dynamic prediction data at least including the wind scale, wind speed, wind direction, tide level, ocean current velocity and ocean current direction; traversing the sample sequence, performing calculation to obtain the sample at the smallest weighted Euclidean distance with the environment dynamic prediction data, extracting the posture data of the ship in the smallest sample, and taking the posture data as the posture prediction data of the ship at set time; and the ship posture data at least including data of six degrees of freedom, such as transversing, rolling, surging, pitching, rotating and lifting.