The invention discloses a solar cell electrode preparation mold and a preparing method thereof. The mold comprises an upper cover and a base, wherein the base comprises at least one groove part for placing a component to be treated, a limiting structure is arranged around the groove part, the upper cover comprises a first hollowed part corresponding to an electrode of the component to be treated and a limiting matching structure corresponding to the limiting structure, and the first hollowed part corresponds to the electrode on one side of the component to be treated in size. During treatment, the component to be treated is placed in the groove part; then, the upper cover is closed so that the limiting structure and the limiting matching structure are combined; after the treatment of one side of the part to be treated is finished, the mold is turned over so that the other side of the component to be treated can be treated. With adoption of the solar cell electrode preparation mold, the component to be treated can be limited so that the component to be treated can be limited accurately so as to prevent the connectivity of a coated film on the edge and overcome the problem of electric leakage on the edge.