Automatic piecing device of composite parts

The utility model provides an automatic piecing device of composite parts. The automatic piecing device ensures that the stress direction imposed to sizing material by a pressing roller is perpendicular to the joint plane of the sizing material; the force imposed by an air cylinder can be completely released; component force in other directions cannot be generated; the pressing strength is guaranteed; the joint pressing of the composite part needs no manual intervention; the work efficiency is high. The automatic piecing device of composite parts comprises an upper support frame, wherein the upper support frame is parallel to a composite part sizing material feeding track below the upper support frame. The automatic piecing device of composite parts is characterized in that a framework is arranged below the upper support frame; two pressing rollers are arranged below the framework; the two pressing rollers are arranged in the length direction of the composite part sizing material feeding track below the pressing rollers; two ends of each pressing roller are respectively supported to lower end positioning structures of corresponding swinging arms; middle upper parts of the swinging arms in corresponding positions are respectively provided with rotation shafts; two ends of each rotation shaft are respectively supported in the relative positions on two sides of the framework; the swinging arms corresponding to the two pressing rollers are arranged oppositely.