The invention discloses a method for using a microchannel reactor to prepare a paracyclophane monomeric compound. The method comprises the steps of preheating, intermediate synthesizing, product synthesizing, oil-water separating, purifying and the like. The paracyclophane monomeric compound is prepared in the continuous microchannel reactor. The method for using the microchannel reactor to prepare the paracyclophane monomeric compound has the advantages of being low in cost and small in energy consumption, having less three wastes, having continuous controllability, having no amplification effect and the like, and is capable of being subjected to simple amplification with equal ratio according to a demand of practical production.