The invention provides a protective film forming method. The protective film forming method comprises the following steps: coating a to-be-formed device with a protective film material; and while solidifying the protective film material by using a solidifying device, applying pressing force to the upper surface of the protective film material by using a pressing device to form a protective film. The invention further provides protective film forming equipment. The protective film can be manufactured in field, therefore, the size of the protective film can be adjusted at any time, the process time is shortened, and the yield of the product is improved.