The invention provides a method for preparing glycol through hydrolysis of ethylene glycol monomethyl ether. The method comprises the following steps: a fresh raw material ethylene glycol monomethyl ether and water passes through a reaction zone carried with a solid acid catalyst and are subjected to a reaction, a reacted mixture passes through a separating system for separating to obtain a target product glycol, by-products methanol and dimethyl ether, and a glycol-based derivative, and unreacted raw material ethylene glycol monomethyl ether and water, the target product glycol is introduced into a product collection system, the by-product methanol and dimethyl ether are introduced to a by-product collection system, the unreacted raw material ethylene glycol monomethyl ether, the unreacted raw material water and the by-product glycol-based derivative for circulation, the materials and fresh raw material ethylene glycol monomethyl ether and water are mixed, and a mixture is introduced into the reaction zone for reaction. The brand new method for preparing glycol through hydrolysis of ethylene glycol monomethyl ether has the advantages that the catalyst life is long, and the stability is good.