Provided is a foam breaker for a fermentation tank. The foam breaker for a fermentation tank, according to an embodiment of the present application, may comprise: a disk-shaped body (100) having a first hollow part (110) at the center portion thereof; a support (200), which has a second hollow part (210) communicating with the first hollow part (110), and which is formed so as to extend from the upper surface (120) and the lower surface (130) of the body (100); and a plurality of first vanes (310, 320, 330, 340, 350, 360, 370, 380) installed on the lower surface (130) of the body (100).
