Joint device of folding bed

A joint device of a folding bed, comprising:

• a first connecting arm for connecting a supporting leg of a folding bed, a through-hole being provided on the first connecting arm;
• a second connecting arm for connecting a frame of the folding bed, the second connecting arm being arranged on an upper end part of the first connecting arm, and being connected with the first connecting arm through a rotating shaft;
• and
• a connection locking mechanism comprising two pressing pieces arranged respectively on each side of the second connecting arm, each of the pressing pieces being connected with a hook, and the two pressing pieces being slidable toward or away from each other through springs, so that the hook passes through the second connecting arm and is hooked into or detached from the through-hole, the second connecting arm being locked with the first connecting arm when the folding bed is expanded, and the second connecting arm being rotatable around the first connecting arm when the folding bed is stored.