Coaxial 3D printer nozzle and working method thereof

The invention discloses a coaxial 3D printer nozzle and a working method thereof. The coaxial 3D printer nozzle comprises a support, an outer barrel, an inner barrel, a coaxial nozzle body, an extrusion piston and a linear driving device. The outer barrel is arranged at the bottom of the support; the inner barrel is arranged in the outer barrel and a cylinder cavity is formed; the coaxial nozzle body is arranged at the lower end of the outer barrel; the extrusion piston is movably arranged in the cylinder cavity; the linear driving device is arranged on the support and can drive the extrusion piston to reciprocate in the cylinder cavity. The coaxial 3D printer nozzle is reasonable in structural design, the outer barrel and the inner barrel are coaxially arranged ingeniously, different materials can be placed into the outer barrel and the inner barrel, then the two different materials are extruded at the same time through the coaxial nozzle body, printing time is saved to a large extent, printing quality is improved, 3D printer consumables do not need to be replaced when different colors or different material portions are printed, it is only needed that the linear driving device and a compressor are correspondingly controlled to be in a work state or in a stop state, and the coaxial 3D printer nozzle is easy and convenient to use and favorable for wide application and popularization.