The invention provides a catalytic cracking anti-metal liquid increasing agent and a preparation method thereof. The catalytic cracking anti-metal liquid increasing agent consists of a VPI-5 molecularsieve as well as an antimony-based nickel passivant and heteropoly acids which are carried in pores of the VPI-5 molecular sieve, and the mass percentages of the components are as follows: 70-98% ofthe VPI-5 molecular sieve, 0.5-20% of the nickel passivant and 1-10% of the heteropoly acids. By adopting the anti-metal liquid increasing agent provided by the invention, a nickel porphyrin compoundcan be concentrated in VPI-5 pores to implement a cracking reaction, a generated metal nickel is controlled in the VPI-5 pores, the toxic and harmful functions on a catalytic cracking catalyst is reduced, the nickel element can be rapidly exposed to react with the nickel passivant, the reaction selectivity can be improved, generation of coke can be reduced, and liquid products such as gasoline anddiesel oil can be increased.