Single-nozzle double-material-opening color 3D printing device and working method thereof

The invention belongs to the technical field of additive manufacturing, and particularly relates to a single-nozzle double-material-opening color 3D printing device and a working method thereof. The printing device comprises a spray head main body, a material barrel and a discharging pipeline; the nozzle main body is integrally formed by a hollow cylinder and a hollow inverted cone; discharging pipelines are arranged on the two sides of the hollow inverted cone, and platinum sheet electrodes are arranged at discharging ports of the discharging pipelines and electrically connected with programming direct-current power supply equipment. The material barrel is arranged above the spray head main body, and a threaded insertion pipe is arranged at the bottom of the material barrel and communicated with the spray head main body; according to the printing nozzle device, multi-color 3D printing can be achieved according to needs, the limitation that an existing color printer is provided with multiple nozzles, single i