The invention provides a three-degree-of-freedom ship navigation posture simulation device. The device comprises a platform face, two platform racks, two stand columns, a shaft sleeve, a rotary table, a supporting sleeve, a motor support, a linear stepping motor, a harmonic reducer, a stepping motor fixing base, a motor shaft sleeve, a rigid coupling, a deep groove ball bearing, a connecting base, a connecting head, a gasket, a lining plate, a limiting post, a protective cover, a chassis and the like. By means of the three-degree-of-freedom ship navigation posture simulation device, wide-range simulation rotating motion of the navigation posture of a ship is made; besides, the stepping motor is used as a servo mechanism, and thus the simulation precision of the device is greatly improved. The three-degree-of-freedom ship navigation posture simulation device further has the advantages that energy consumption is reduced, reliability is high, visualization of the navigation posture of the ship is improved, and further study and research are facilitated.