The invention discloses a disposable plastic lighter with the outer surface wrapped by a silica gel soft film. The disposable plastic lighter comprises a plastic lighter body. The layer of milky-white transparent silica gel soft film with the thickness ranging from 0.1 mm to 0.3 mm wraps the outer surfaces of a plastic shell, a wind cover and an operation button of the plastic lighter body. The portions, on a fire outlet, a vent hole and a gas volume regulating switch window, on the silica gel soft film are cut and then removed through a sharp edge after the wind cover is wrapped together. The shore hardness of the silica gel soft film is controlled to be 23 to 30, the tensile strength is controlled to be 7.0 MPa to 7.5 MPa, the elongation at break is controlled to be 500% to 550%, and the tear strength is controlled to be 15 KN/m. It can be avoided that the disposable plastic inflation lighter accidentally injures people when bursting, and cost is low.