The invention provides a multi-parameter-adjustable unpowered underwater submersible vehicle model. The model is suitable for the verification of parameters, such as design attitude parameters, fluidshapes, power factors, navigation trajectories and navigation radii, of various types of large-depth submersible vehicles in rotary body shapes. The model comprises a stem part, a midship section, a stern part, a stern flap, a rudder plate, a ballast assembly and an attitude sensor assembly; the stem part, the midship section and the stern part are rigidly connected to form a good fluid shape; according to the rudder plate, by adjusting the angle of the rudder plate, the lateral thrust of water pressure at different angles is simulated, and the movement trajectory parameters of the unpowered spiral submersing submersible vehicles with different shapes, different areas and different angular lateral thrusts are verified; a groove channel and a stern part groove channel are used for simulating the influences of a vertical propulsion device and a transverse propulsion device on the movement parameters of the submersible vehicles during unpowered spiral and rotary submersing; the stern flapis used for adjusting the heading attitude and other parameters in the unpowered submersing process; the propulsion devices are used for simulating a motor and testing the power angle parameters of the submersible vehicles.