A pacifier holder box comprising: a housing; and a pacifier holder mounted in the housing; characterized in that the housing includes a first cover and a second cover pivotally connected with each other by a pivot member; the housing has a side integrally formed with a clamping member having an annular frame; the first cover has an inner face provided with a first receiving chamber; the first receiving chamber of the first cover has a periphery provided with a first opening; the first receiving chamber of the first cover has an inner wall provided with a first positioning portion; the first cover has a periphery provided with a first locking edge; the second cover has an inner face provided with a second receiving chamber; the second receiving chamber of the second cover has a periphery provided with a second opening juxtaposed to the first opening, and a passage is formed by the first opening of the first cover and the second opening of the second cover; the second receiving chamber of the second cover has an inner wall provided with a second positioning portion positioned on the first positioning portion of the first cover; the second cover has a periphery provided with a second locking edge locked onto the first locking edge of the first cover; the pacifier holder is located between the first receiving chamber of the first cover and the second receiving chamber of the second cover; the pacifier holder is provided with two elastic legs, and a receiving hole is defined between the two elastic legs of the pacifier holder; a pacifier is received in the receiving hole of the pacifier holder and is positioned between the two elastic legs of the pacifier holder; and the pacifier extends through and protrudes outward from the passage of the housing. a housing; and a pacifier holder mounted in the housing; characterized in that the housing includes a first cover and a second cover pivotally connected with each other by a pivot member; the housing has a side integrally formed with a clamping member having an annular frame; the first cover has an inner face provided with a first receiving chamber; the first receiving chamber of the first cover has a periphery provided with a first opening; the first receiving chamber of the first cover has an inner wall provided with a first positioning portion; the first cover has a periphery provided with a first locking edge; the second cover has an inner face provided with a second receiving chamber; the second receiving chamber of the second cover has a periphery provided with a second opening juxtaposed to the first opening, and a passage is formed by the first opening of the first cover and the second opening of the second cover; the second receiving chamber of the second cover has an inner wall provided with a second positioning portion positioned on the first positioning portion of the first cover; the second cover has a periphery provided with a second locking edge locked onto the first locking edge of the first cover; the pacifier holder is located between the first receiving chamber of the first cover and the second receiving chamber of the second cover; the pacifier holder is provided with two elastic legs, and a receiving hole is defined between the two elastic legs of the pacifier holder; a pacifier is received in the receiving hole of the pacifier holder and is positioned between the two elastic legs of the pacifier holder; and the pacifier extends through and protrudes outward from the passage of the housing.