A suspension type ship collision prevention multilayer energy consumption device comprises a collision prevention box which is arranged on the outermost side and provided with an inclination angle. The L-shaped base buoyancy tank is connected with the pier and supports the anti-collision tank; the buffer device is arranged between the base buoyancy tank and the external anti-collision tank; when the ship body impacts the energy consumption device, energy is consumed through large deformation of the buffer device; the bearing surface of the base buoyancy tank is higher than the horizontal planeto prevent the buffer device from being soaked and corroded and increase durability; the thin wall on the outer side of the anti-collision box inclines downwards, the anti-collision box can be prevented from warping upwards in the ship collision process, and the optimal working efficiency of the buffering device is guaranteed. The whole device floats on the water surface through the base buoyancytank, the external anti-collision tank directly bears impact force during ship collision, most collision force is transferred to the buffer device to be passively extruded and deformed to consume energy, and therefore the collision force borne by the pier is reduced, and damage to the device is reduced to the maximum extent while the safety of a bridge and a ship is guaranteed.