The invention discloses a vegetable seed pelleting agent with both insecticidal and antiviral effects, and an application method thereof. The seed pelleting agent comprises the following components: an insecticide, an antiviral agent, a filling material, a bonding agent, a wetting agent, a dispersing agent, and trace elements. After being treated by using the pelleting agent, seeds are coated with the insecticidal and antiviral composite agent, such that good prevention effect can be provided against seedling-phase pest direct damage and turnip mosaic viral disease, cucumber mosaic viral disease, tobacco mosaic viral disease, tomato spotted wilt viral disease, and the like spread by insect mediators. The vegetable seed pelleting agent has the following advantages: when the seeds are pelleted, the effect of the agent is slowly released, and is absorbed to the upper part of a plant through the root part of a germinated seed, such that vegetable seed-spread diseases and seedling-phase diseases and pests can be effectively prevented and treated. Also, above-ground part pesticide application frequency can be reduced, such that vegetable production period pesticide dose and labor cost can be reduced. Therefore, labor can be saved, and pesticide can be saved.