The invention relates to an alpha-diimine compound, a metal complex and a load containing the compound and application thereof. The structural formula of the compound is shown as a formula I. The alpha-diimine compound is provided with a hydroxyl radical on a substituent group connected to an acenaphthene ring, the compound can react with active radicals on a carrier after chemical modification to form covalent bonds, so that the alpha-diimine compound is loaded on the carrier in a covalent bonding manner; and the metal complex containing the alpha-diimine compound, the load containing the alpha-diimine compound and a load of the metal complex containing the alpha-diimine compound can be further obtained. The metal complex containing the alpha-diimine compound and the load containing the metal complex can be used in polymerization of olefins as main catalysts. The metal complex of the load-type alpha-diimine compound can overcome the disadvantages of kettle adhesion, difficult control for polymer conformation, large using amount of catalyst promoter, poor heat stability and the like, and the covalent bonding load manner avoids the complex from being separated from the carrier .