The invention discloses an enzalutamide soft capsule and a preparation method thereof. The soft capsule is composed of capsule content and capsule shell. The content is composed of enzalutamide and pharmaceutical excipients; the capsule shell is composed of gelatin, glycerin, sorbitol, titanium dioxide and purified water. The soft capsule can be prepared through the following method: mixing caprylic capric macrogol glyceride, butylated hydroxyanisole, butylated hydroxytoluene and enzalutamide to obtain the soft capsule content material; mixing gelatin, glycerin, sorbitol Alcohol, titanium dioxide and purified water are mixed to obtain the soft capsule shell material; the soft capsule content material and the soft capsule shell material are subjected to pelletizing treatment on a soft capsule machine, so as to obtain the enzalutamide soft capsule capsule. The advantages of this product are: easy to carry for administration, good drug stability, fast dissolution of active ingredients and high bioavailability.