The invention relates to multifunctional corn composite granules, which comprise the following raw materials in percentage by weight: 0.1 to 3.0 percent of carbendazol, 0.1 to 3.0 percent of mancozeb, 0.5 to 3.5 percent of ethephon, 0.1 to 3.0 percent of compound sodium nitrophenolate, 1.0 to 3.5 percent of imidacloprid, 0.5 to 3.0 percent of phoxim or monosultap and the balance of auxiliary materials. Bactericide, pesticide and growth adjustor are compounded in the granules to integrate pest removal, pathogenic bacteria prevention and control and growth adjustment, and the granules are applied at one time and can simultaneously prevent and control multiple pests and pathogenic bacteria of corn; and the total prevention and control rate of the granules on the corn pests reaches over 90 percent, and the average yield increase range of the corn is 25 to 35 percent. the granules have broad spectrum, high efficiency, low toxicity, good compatibility, complementary effect and long acting time, can ensure that the corn is not harmed by the pests such as stem borers, aphids and the like during the whole corn growth period by early application, and thoroughly solve the problem of difficult prevention and control of plant diseases and insect pests in the medium and later stages of the corn growth.