The invention discloses a marine thrust bearing energy dissipation damper and an assembling method thereof. The marine thrust bearing energy dissipation damper comprises a bottom plate, a housing anda stressed block, wherein a second sealed working cavity is formed between the bottom plate and the housing; an energy dissipation component and a damping liquid are arranged in the second sealed working cavity; and the energy dissipation component comprises a first thrust piston, a second thrust piston, a piston cylinder, a thrust connecting rod and a porous damping plate. According to the marinethrust bearing energy dissipation damper and the assembling method thereof, the damping liquid is used as an energy dissipation medium of the damper, so that rigid collision generated by longitudinalvibration is better avoided, and the shafting is more stable. By adopting modular design and manufacturing, the structure is compact, the installation space and the structural load of a thrust bearing are reduced, the weight is lighter, the manufacturing cost is greatly reduced on the premise of improving the stability, and therefore the thrust bearing is economical and energy-saving, and has higher vibration suppression efficiency and higher parameter stability.