The invention discloses an organic rare earth metal solid catalyst. The organic rare earth metal solid catalyst is a compound M(org)n shown in a general formula (1). In the formula, M represents one or more of lanthanum, cerium, praseodymium and neodymium, n is in a range of 1-8, the org has a chemical formula shown in the description, R1 and R2 represent hydrogen or C1-7 alkyl, R represents C1-10 alkyl and X and B represent one or more of C, N, O, P and S. The catalyst can effectively replace the traditional catalyst such as concentrated sulfuric acid and p-toluenesulfonic acid and is used in an organic esterification reaction or an ester interchange reaction. The catalyst can successfully replace metal catalysts such as organic lead and organic tin polluting the environment and be used in polymer synthesis so that environment pollution is avoided.