3D printing device and printing method thereof

The invention provides a 3D printing device which includes a support base, a support foot base, a bracket, a Z-axis line rail drive mechanism, a complete machine harness, a Y-axis line rail, a material guide tube, a 3D printing nozzle, a driving motor and a thermoforming plate structure. A column structure, a printing control box structure, an extruder, a connection tube, a power socket and a photoelectric limiter are conveniently carried. By means of the 3D printing device, a hand-holding handle and a non-slip sleeve are held with the hand to be carried and moved, the using convenience is increased, and the stability and the shock absorption effect are increased under the function of the support foot base; a printed product is displayed on an aluminum-based hot bed board, a horizontal scale line, a reference line groove and a longitudinal scale line are checked, and the printed product is conveniently supported, jacked and checked; and the 3D printing device is simple and clear in printing method, operation