The invention discloses a protective film pasting jig for a washing machine observation window annulus panel with an irregular section. The protective film pasting jig comprise a platform. The platform is provided with a rotary disc on which the observation window annulus panel can be placed. The rotary disc can be driven by a driving device to rotate, and then the observation window annulus panel is driven to rotate. The platform is further provided with a base. The base is provided with a rotary device used for holding a protective film. The protective film can rotate on the rotary device. A synchronizing mechanism is arranged between the base and the rotary disc, so that the base moves up and down along with the irregular section of the annulus panel. The protective film pasting jig has the main beneficial effects that the structure is simple and ingenious, automatic production is achieved, a large amount of labor cost can be reduced, uncontrollable factors of manual work and waste of the protective film are reduced, and work efficiency and quality of pasting of the protective film are promoted effectively.