The invention provides a sandstone reservoir acidification method. The sandstone reservoir acidification method comprises the steps that acidification of sandstone reservoirs is graded according to logging data of the sandstone reservoir; the amount of acid liquor used for the sandstone reservoir of each acidification grade is determined based on the thickness of the sandstone reservoir of each acidification grade; the amount of temporary plugging agents used for the sandstone reservoir of each acidification grade is determined according to the number of holes and perforation eyelet parameters of the sandstone reservoir of each acidification grade; the temporary plugging agents are degradable at a preset temperature; and prepad fluid, the acid liquor and replacement liquor are injected into the sandstone reservoirs of all acidification grades in the sequence that acidification grades are decreased gradually, when the prepad fluid is injected into the sandstone reservoir of the next acidification grade, the temporary plugging agents are injected into the sandstone reservoir of each acidification grade, so that a plurality of perforation eyelets of the sandstone reservoir of each acidification grade are filled with the temporary plugging agents. According to the sandstone reservoir acidification method, the sandstone reservoirs are acidized uniformly, and the cost of sandstone reservoir acidification can be reduced.