3D printing nozzle of reconfigurable composite material

The 3D printing spray head comprises a spray head body, a plurality of quick connectors are installed on the top and the side wall of the spray head body, the quick connectors are installed on the side wall of the spray head body through expansion head connecting pieces, and a plurality of throat pipes are installed in the spray head body; each throat pipe extends downwards to the outer part of the spray head body and is matched with the corresponding nozzle; the quick connectors are communicated with the corresponding throat pipes through first connecting pipes; and when the two quick connectors are communicated, a second connecting pipe is arranged between the two quick connectors. Through the arrangement of the quick connector and the connector connecting pipe, the feeding port of the 3D printing nozzle can be expanded according to the use requirement, and therefore 3D printing of the continuous fiber reinforced composite material is achieved; and by arranging a heating ring and a preheating patch, the mel