Locking mechanism and foldable fence

A locking mechanism, comprising:

• a shell, wherein the shell comprises a first cavity and at least one second cavity, the first cavity is not communicated with the second cavity, the first cavity is used to place a fixing member, the second cavity is used to place a movable member, and the shell is provided with a first pressing hole on an inner side wall where the first cavity is located;
• a locking cover, wherein the locking cover is arranged on an outer side wall of the shell, the locking cover has a first connecting end and a first covering end, the first connecting end is hinged with the shell, and the first covering end is used to cover the first pressing hole;
• a locking column, wherein the locking column is arranged on the fixing member, and an elastic member is further arranged between the locking column and the fixing member;
• wherein the locking column is configured to be placed in a locked position and an unlocked position, when the locking column is placed in the locked position, the elastic member is in a naturally extended state to enable the locking column to protrude out of the first pressing hole from the first cavity, and the first covering end covers the first pressing hole;
• when the locking column is placed in the unlocked position, the first covering end is separated from the first pressing hole, the elastic member is compressed by force, and the locking column retracts from the first pressing hole into the first cavity.