The invention provides a method for preparing taurine through solid isethionic acid sodium salt. The method includes the following steps that continuous concentration and crystallization are conducted on addition liquid prepared by enabling sodium hydrogen sulfite to react with ethylene oxide, dissolution is conducted through the solid isethionic acid sodium salt obtained in a centrifugal mode, ammonia is fed, sodium taurate is obtained through a high-temperature high-pressure synthetic reaction, finally, sulfuric acid neutralization and extraction are conducted on, solid taurine is obtained, sodium taurate is regenerated by applying mother liquor to the synthetic reaction indiscriminately, and zero emission of taurine mother liquid is achieved. According to the method, concentration and crystallization are conducted on the addition liquid, water-soluble impurities in the addition liquid are removed, and the overall quality of the addition liquid is improved, so that the impurities generated in the synthesis reaction are reduced effectively, the quality, the crystal form and the yield of products can be improved remarkably, meanwhile, indiscriminate application of all of the mother liquor is achieved, and the problem that in a traditional process, the environment is polluted due to the fact that extracted taurine mother liquor cannot be well utilized and is discharged is well solved.