The invention discloses an in-vitro rapid propagation method for billbergia pyramidalis. The method includes the steps: acquiring explants, performing sterilization for the explants, inoculating the sterilized explants into primary culture media, and cultivating the explants to obtain adventitious buds; transferring the adventitious buds into subculture media, and cultivating the adventitious buds to obtain subculture seedlings; transferring the subculture seedlings into rooting culture media, and cultivating the subculture seedlings to obtain billbergia pyramidalis seedlings; hardening the seedlings, and transplanting the hardened seedlings. A preparation method of the primary culture media includes the steps: firstly, adjusting concentration of ferric sulfate and sodium sulfate; secondly, adding aspartic acid and indoleacetic acid based on improved White culture media. A preparation method of the subculture media includes the steps: firstly, adjusting concentration of molybdenum oxide and boracic acid; secondly, adding vitamin K1, indoleacetic acid and naphthylacetic acid based on improved White culture media. A preparation method of the rooting culture media includes the steps: adding ammonium molybdate and gibberellins based on B5 culture media. According to the method, billbergia pyramidalis propagation coefficient is effectively improved, sufficient seedling sources are provided for commercial production of billbergia pyramidalis, and a tissue culture method can effectively shorten seedling period as compared with a sowing propagation method.