A bulk bag for TMR fermentation is provided to prevent air from flowing in the bag by manufacturing the bulk bag in a triple structure and forming sewing parts of the inside and outside to be crossed each other. A bulk bag for TMR fermentation includes: a body(1); an upper cover part(3); a lower discharge part(2); and connection parts(4). The body, upper cover part, and lower cover part are formed in a triple structure of an inner cover, an outer cover, and vinyl sheet, and divided by the connection parts. The connection part comprises an inner sewing part formed by folding the inner cover and vinyl sheet to be overlapped and sewing one end of a connection band on the folded end, and an outer sewing part formed by sewing the end of the outer cover of a folded state on the end of the connection band sewed on the inner sewing part.
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