The invention discloses a turnip yellow mosaic virus (TYMV)-induced cruciferous endogenous gene silencing method and application thereof. The method comprises the steps of taking target gene complementary deoxyribonucleic acid (cDNA) as a template for carrying out polymerase chain reaction (PCR) amplification, purifying a connecting vector, converting escherichia coli, and carrying out positive clone sequencing to obtain a target coding region full-length CDS sequence; according to the sequencing result, selecting a (T / A / G / C) TGA, (T / A / C) TAG or (T / A / C) TAA backwards selection 40bp sequence; adding a reverse complementary sequence into the 3' end, adding sequences, which have the homologous sequence length of 15bp and correspond to the two ends of a linearized vector, into the two ends tosynthesize double-stranded DNA fragments, and enabling the synthesized double-stranded DNA fragments to be in fusion connection with a vector pTY-s, converting the escherichia coli by a product of thefusion connection, culturing and extracting plasmids, carrying out gene gun bombardment when first true leaves of seedlings come up, and rapidly transferring the seedlings into cultivation soil for culturing. The TYMV-induced cruciferous endogenous gene silencing method is easy in vector construction, high in transfection efficiency and obvious in gene silencing effect, and maintains characters to be enduring.