The invention discloses a three-dimensional printer for printing liquid materials. The three-dimensional printer comprises a three-dimensional adjusting mechanism, and a printing sprayer which performs three-dimensional printing under adjustment of the three-dimensional adjusting mechanism, wherein the printing sprayer comprises a nozzle driving motor, a tube outer sleeve, a tube sleeved in the tube outer sleeve; a charging hole and a sprayer which is fixed at the other end of the tube outer sleeve are arranged on one side at the bottom end of the tube; a nozzle is arranged on the sprayer; a feeding hole which is mutually opposite to the charging hole, a tube heating sleeve which is sleeved on the outer wall of the tube outer sleeve and is used for heating the tube outer sleeve and the tube, a nozzle heating sleeve used for heating the nozzle, and a hopper used for containing a printed material are arranged on one side of the sprayer; and the hopper is mutually connected with the feeding hole through a pipeline with a feeding control valve. The three-dimensional printer is stable in jet, the food materials can be treated according to a food material temperature regulation process, materials can be automatically supplemented, the ejected material can be rapidly cooled and deposited, the three-dimensional printer is high in precision, sanitary and convenient, and chocolate, cream, jam and multiple liquid food materials can be printed.