The present invention relates to the preparation process of p-chlorophenyl formonitrile, and aims at solving the problems of engineering amplifying effect in reactor, lower destination product yield, etc. The present invention adopts materials including toluene chloride, ammonia and oxygen and active components with the general expression of V1.0CraAbBcCdOx, where A is at least one selected from P, B and Bi; B is at least one selected from alkali metals and alkali earth metals; and C is at least one selected from Mn, Ti, Ni, Co, Pb, Fe, Mo and W. The present invention may be used in industrial production of p-chlorophenyl formonitrile. |