The invention discloses an astaxanthin self-emulsifying soft capsule preparation and a method for preparing the same, which relates to an astaxanthin preparation, in particular to the astaxanthin self-emulsifying soft capsule preparation capable of self-emulsifying in a body after oral administration as well as the method for preparing the same. The invention provides the astaxanthin self-emulsifying soft capsule preparation which has high bioavailability and good oxidation resistance and can self-emulsify in the body after the oral administration. The compositions of the astaxanthin self-emulsifying soft capsule preparation and the content by mass ratio are as follows: astaxanthin raw material: oil phase: emulsifier: coemulsifier is equal to 1: 20-60: 10-70: 0-30, wherein, an oil phase adopts natural vegetable oil or fatty acid ester, the emulsifier adopts nonionic emulsifier, and the coemulsifier adopts chain alcohol or short chain alcohol. The astaxanthin raw material, the oil phase, the emulsifier and the coemulsifier are added into a container, N2 is aerated into the container, and astaxanthin self-emulsifier is obtained by ultrasonic vibration; and the astaxanthin self-emulsifier is cooled to be the room temperature and is pressed to obtain the astaxanthin self-emulsifying soft capsule preparation.