Supporting assembly and folding bed thereof

The utility model relates to a supporting assembly and a folding bed thereof, and relates to the technical field of folding beds, the supporting assembly comprises a first supporting plate, a second supporting plate, a limiting piece arranged on the second supporting plate in a sleeving manner, and an extension section arranged on the second supporting plate and extending towards the first supporting plate; the second supporting plate is hinged to the first supporting plate. The extension section is provided with a limiting protrusion for limiting excessive overturning of the first supporting plate and the second supporting plate. The first supporting plate is provided with a clamping groove used for clamping the limiting protrusion. The limiting piece is used for limiting overturning between the first supporting plate and the second supporting plate. The connecting rod has the effect that the first connecting rod and the second connecting rod cannot quickly form a straight line, so that the limiting piece is