The invention discloses an aluminum alloy cylinder cover. A cam shaft or double cam shafts are arranged at the upper part of the aluminum alloy cylinder cover, and the lower part forms a combustion chamber with a cylinder body and a piston; a timing kit gear and a shell thereof are arranged at the front end, and a water pump is arranged at the back end; an intake way is formed in one end, and an exhaust way is formed in the other end; an oil way positioned in a cam shaft chamber is connected with the cylinder body through a cylinder cover; the water way surrounds the intake way, the exhaust way and the combustion chamber, and is connected with the cylinder body; and the cylinder cover adopts an Al-Cu-Ni-Co-Nb-Zr alloy, wherein the content of Cu is 1-5 wt%, the content of Ni is 1-5 wt%, the content of Co is 0.2-1 wt%, the content of Nb is 0.5-1.5 wt%, the content of Zr is 0.2-1%, and the balance is Al. The aluminum alloy cylinder cover improves the room-temperature and high-temperature performances through improving the structure and the material performances, can resist high temperature, and bears higher impact force.