Rhodium catalyst is a precious metal catalyst made of rhodium as the main active component. It shows excellent activity in hydrogenation, oxidation, hydroformylation and carbonylation reactions. Rhodium catalyst can effectively inhibit the derivative reaction of reactants in the reaction process, thereby improving the efficiency of the reaction. Rhodium catalyst can also be used to catalyze oxidation reactions, such as the oxidation of methanol to formic acid and the oxidation of ethanol to acetic acid. In addition, rhodium catalyst can also be used to catalyze hydrolysis reactions, such as the hydrolysis of ethanol to acetaldehyde.