A device, an instrument and a belt for tightening the cervix are provided. The device has a belt and an instrument. The belt is used to tie around and tighten the cervix. The instrument includes: a first outer pipe and a second outer pipe, and the first outer pipe and the second outer pipe rotatable relative to each other； two fork structures connect the first outer pipe and the second outer pipe respectively and are detachably inserted into the belt.本揭露提供一種用於約束子宮頸的裝置、其器械及其束帶，該裝置包括一束帶與一器械。束帶用以束於子宮頸上以約束子宮頸；器械用以將束帶束於子宮頸上，器械包含：一第一外管與一第二外管，第一外管與第二外管為可相對轉動；二叉狀結構，分別連接第一外管與第二外管之一軸向端，叉狀結構可分離地插入束帶。
