The invention relates to a ship window and particularly relates to a welding type half-fixing half-opening window and belongs to the technical field of ship outfitting. The window comprises a main window seat, a middle window seat and an auxiliary window seat. A hinge seat is welded on the main window seat, a movable window frame is hinged to the hinge seat, and main tempered glass is arranged in the movable window frame. A main glass compression plate is connected onto the movable window frame through screws and compresses the main tempered glass in the movable window frame. A wind frame compression mechanism is arranged between the main window frame and the movable window frame, and the movable window frame can be fastened on the main window seat through the window frame compression mechanism. A glass retaining frame is welded in the auxiliary window seat, an auxiliary glass compression plate is connected onto the auxiliary window seat through screws, an auxiliary window frame is arranged between the glass retaining frame and the auxiliary glass compression plate and is compressed in the glass retaining frame through the auxiliary window frame, and auxiliary tempered glass is arranged in the auxiliary window frame. The window is flexible, capable of meeting the window opening ventilation substance transfer requirement and providing large visual fields and convenient to open.