The invention discloses a method for extracting 
astaxanthin from 
haematococcus pluvialis. The method comprises the steps of (1) breaking walls of sporophore: taking fresh wet 
algae mud, adding 3 mol / L HCl with an amount of two times by 
mass of the fresh wet 
algae mud, stirring uniformly, stirring for 3 min at a temperature of 50 DEG C with a stirring speed of 180 times per minute, cooling rapidly, centrifuging and washing and taking the 
algae bodies; and (2) extracting 
astaxanthin: adding 
ethanol into the wall-broken sporophore with an amount of two times of the sporophore, oscillating for 5 min at a low temperature of 10 DEG C, centrifuging, recovering 
ethanol, repeating for 2 times, merging the recovered 
ethanol; concentrating at a low temperature and in vacuum; and recovering ethanol by 
evaporation, and thus the left material being 
astaxanthin. The method is simple and can be easily understood, is reasonable in operation, enables the 
haematococcus pluvialis to perform nutritive growth relatively well, is relatively fast in transformation from nutritive growth to non-nutritive growth, and accumulates relatively much 
haematococcus pluvialis, thereby increasing efficiency and stability of culture, transformation and accumulation and effectively preventing 
contamination of miscellaneous algae during a culture process. The manufactured astaxanthin is relatively low in cost.