The invention relates to a cross-linking agent for an electrophoretic paint and a production technology of the cross-linking agent. The cross-linking agent is prepared from the following raw materials in parts by weight: 28-40 parts of compound alcohol ether, 12-19 parts of TDI, 10-14 parts of polyether and 0.1-0.2 part of an organic tin fluid. The cross-linking agent has the advantages of being simple in technology, high in operability and the like; excessive epoxy resin open loops can be prevented by the TDI; too much solvent loss caused by over-high water solubility is avoided; and polyether N-220 is better than alcohol in solubleness. With the organic tin fluid as a catalyst, the efficiency can be improved.