The invention belongs to the field of aviation technology, in particular to a folding brace type wing folding mechanism, the folding mechanism of the folding brace type wing of the invention realizesthe deployment and folding of the wing by driving the rotation of the folding rocker I by the folding actuator cylinder, the folding actuating cylinder drives the small angle rotation of the folding rocker II, the locking seat and the locating pin seat arranged on the folding rocker II are displaced, so that a pin hole on the locking seat is coaxial with the through hole of the positioning pin seat, The locating pin in the through hole is inserted into a pin hole on the locking seat under the action of the gate wire to realize the locking of the wing in the unfolding and folding state. The folding brace-type wing folding mechanism of the invention is light in weight, can realize the reliable switching between the unfolding and folding states of the wing, and can be reliably locked in the unfolding and folding limit positions.