The invention relates to an anthurium laccase gene and a plant expression vector thereof, which are prepared through the following steps of: respectively extracting the total RNA (Ribonucleic Acid) in anthurium Alabama and a white spathe mutant thereof, purifying mRNA, constructing a suppression substractive hybridization library, then designing a specific primer, using the cDNA (complementary Deoxyribonucleic Acid) after the reverse transcription of the total RNA of the anthurium as a template to obtain the whole-length cDNA of the laccase gene by utilizing a PCR (Polymerase Chain Reaction) method, connecting with a pMD-18T vector, converting a colibacillus JM109 competent cell, picking positive clone to obtain the anthurium laccase gene, substituting a reporter gene GUS on a plant expression vector pBI121 with the anthurium laccase gene, and constructing a new plant expression vector named as pLacBI121. In the invention, the laccase gene related to the resistance of procyanidin and plants is obtained by utilizing the anthurium Alabama and the white spathe mutant thereof, and the invention lays the foundation for the transgenic cultivation of different spathe colors and varietiesof the anthurium and the varieties of the anthurium for cold-resistance, disease resistance and the like and has important theoretical and practical meanings.