Coated electrode foil, manufacturing method thereof and electrolytic capacitor

The invention provides a coated electrode foil, an aluminum foil substrate and an aluminum powder sintered body coating located on at least one surface of the aluminum foil substrate, the aluminum powder sintered body coating is formed by stacking and sintering aluminum powder into a whole, and the aluminum powder sintered body coating is conductively connected with the aluminum foil substrate; and the aluminum powder sintered body coating is provided with an infiltration tank facing an external opening. Due to the existence of the infiltration tank in the aluminum powder sintered body coating, the infiltration difficulty of the bottom coating can be reduced, the capacity extraction ratio can be increased, the hardened aluminum powder sintered body coating can be divided into small blocks,a space is provided for bending, and the bending resistance frequency of the composite electrode foil is increased. The infiltration grooves in the aluminum powder sintered body coating form an array, after the aluminum powd