The invention discloses a 3D printer, and aims at solving deficiencies of complex structures, large size and low printing accuracy of 3D food printing equipment. The printer comprises a host, a spray nozzle, an X-axis assembly, a Y-axis assembly, and a Z-axis assembly. The X-axis assembly comprises a printing table and an X-axis motor; sliding rails supported by the host is arranged on the lower surface of the printing table; two sides of the sliding rails on the host are equipped with a plurality of guide wheels; and the lower surface of the printing table is connected to an X-axis synchronous belt. The Y-axis assembly comprises a Y-axis guiding beam, Y-axis guiding rails, and a Y-axis motor; a Y-axis sliding block is slidably mounted on the Y-axis guiding rails; the Y-axis sliding block is connected to a Y-axis synchronous belt; and the spray nozzle is mounted on the Y-axis sliding block. The Z-axis assembly comprises a Z-axis guiding beam, Z-axis guiding rails, and a Z-axis motor; a Z-axis sliding block is slidably mounted on the Z-axis guiding rails; the Z-axis sliding block is fixedly connected to the Y-axis guiding beam; the Z-axis motor is connected to a lifting screw; a lifting threaded sleeve is arranged on the Y-axis guiding beam; and the lifting threaded sleeve is adaptively connected to the lifting screw.