The present invention relates to a butterfly valve for chemicals. The butterfly valve includes: an upper body (110) forming a support part (111) vertically in the upper part; a lower body (120) combined with the upper body (110); a valve sheet (130) including a lock attachment part (131); a sub sheet (140) inserted between the upper body (110) and the lower body (120) and the valve sheet (130); a disc (150) including a shaft (151), forming a plurality of through holes (152) on the surface and including a coating part (153); a rotary shaft (160) formed in the lower part of the lower body (120) to be rotatable; an elastic member (170) installed to come into contact with insertion parts (110a, 120a); and an attachment unit (180) attached inward by being inserted into an attachment space (132) formed inside the valve sheet (130). Therefore, the present invention is capable of preventing accidents by preventing chemical fluids from leaking to the outside.
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