A printer includes: a main body, including a bottom part adjacent to a surface to be printed and a top part opposite to the bottom part, wherein the bottom part is provided with an air inlet and an ink outlet, and the top part is provided with an air outlet; an adsorption assembly, assembled in the main body and including an air suction mechanism, wherein an air intake passage of the air suction mechanism is opened to the air inlet, and an air outlet passage of the air suction mechanism is opened to the air outlet; a printing assembly, assembled in the main body and including a main control and an ink outlet mechanism electrically connected to the main control; and a moving assembly, assembled on the bottom part of the main body and is electrically connected to the main control.