The invention provides a 3D printer with a rotating spray head. The 3D printer comprises a printer shell, a base and an intelligent processing system. The printer shell is arranged on the top of the base; hinges and a printer switch are arranged on the printer shell; a printer door is mounted on the printer shell through the hinges, and an open groove is formed in the printer door; a support, a feeding device and the spray head are arranged in the printer shell; the spray head comprises a first shell, a second shell and a spray head main body; a radiating fan is arranged on the top of the first shell; first fixing seats are arranged on the front side of the first shell, second fixing seats are arranged on the front side of the second shell, and fixing screw holes are formed in the first fixing seats and the second fixing seats correspondingly and internally provided with fixing screws; and a first through hole is formed in one side of the second shell. The 3D printer with the rotatingspray head is reasonable in design and high in safety, and material spraying is uniform.