The invention discloses a method for rapidly producing antrodia comphorata powder through deep liquid state fermentation.The method includes the steps that fermentation liquor which has rich and massive mycelia is rapidly acquired from an antrodia comphorata strain through a semi-continuous fermentation process, and then the mycelia of antrodia comphorata are obtained after being separated from the fermentation liquor through micro-filtration membrane treatment.A traditional antrodia comphorata intermittent batch fermentation process is changed, and micro-filtration of an efficient ceramic membrane is adopted for replacing a centrifuge separation mode on the aspect of separation of the mycelia.The defects that links of the traditional batch fermentation process is abundant, the middle interval time is long, and equipment efficiency is low are overcome through the semi-continuous fermentation process.The fermentation liquor is filtered through the efficient ceramic membrane, the mycelia entering filtrate can be reduced, the yield of the mycelia can be increased, COD of the filtrate is reduced, the sewage treatment amount is reduced, cells are not damaged, and it is guaranteed that all effective ingredients in the cells are recycled.Compared with a traditional process, the method has remarkable economic benefits, social benefits and environmental protection benefits.