The invention relates to the field of ceramic machining, and provides a method for manufacturing a thin ceramic cap body. The method comprises the following steps of 1, film covering, wherein a protection area on a sintered ceramic substrate is covered with a protection material; 2, forming, wherein the exposed part of the ceramic substrate covered with a film is ground, and the cap body is formed; and 3, film removal, wherein the film covering material is removed. When the protection area is a matrix including multiple single cap bodies, after the step of film removal, the method further comprises the fourth step of cutting, wherein the matrix is cut with lasers, and the single ceramic cap body is obtained. According to the method, the problem that a thin material deforms in the sintering process is avoided, and the controllable capacity of the size of the cap body is improved; and the cap body can be used for protecting sensitive or quick-wear parts so that the requirements of card type products, flaky products and other ultrathin products can be met.