3D printing head structure for multi-material extrusion forming

The invention discloses a 3D printing head structure for multi-material extrusion forming. The 3D printing head structure is characterized by comprising a conversion unit and an extrusion unit; the conversion unit comprises a rotating motor, a driving gear, a coupling, a driven gear, a rotary table, a charging barrel, a piston and an extrusion needle head; and the extrusion unit comprises a linear slide table module, a through motor, a matched screw and a motor seat. The rotary table is mounted in the horizontal direction by minus 15 degrees; the charging barrel and the rotary table form an angle of 15 degrees; during working, the target charging barrel is positioned at the lowest point of the rotary table, and has different height differences delta h with other charging barrels; the piston is initially positioned at the top end of the charging barrel; and the screw is driven by the through motor and the linear slide table module to push the piston to slide in the charging barrel so as to extrude high-viscosi