The invention discloses a combined type multifunctional children' vest. The combined type multifunctional children' vest comprises two belly wrap assemblies arranged oppositely at the front and back,both sides of each belly wrap assembly are connected respectively through a plurality of elastic connecting belts, both ends of the elastic connecting belts are connected with the belly wrap assemblies respectively through movable connecting pieces, each belly wrap assembly comprises a belly wrap body, a main shoulder girdle arranged at one side of the upper portion of the corresponding belly wrapbody and a secondary shoulder girdle arranged at the other side of the upper portion of the corresponding belly wrap body, each main shoulder girdle is connected with the corresponding secondary shoulder girdle through a movable connecting piece, the rear side of the bottom of one of belly wrap body is provided with a ring belt, and the middle of the ring belt is movably connected with the middleof the bottom of the other belly wrap body through a fastener. The combined type multifunctional children' vest not only can be used as a vest, but also can be disassembled to be used as a belly wrap, thereby increasing the use range of the vest and improving the use ratio of the vest.