Three-dimensional printer

The utility model discloses a three-dimensional printer which comprises a case, a worktable, a moving device, a control circuit, an extruding mechanism, a worktable heater, thermostats and a temperature sensor, wherein the moving device is mounted in the case, the worktable is mounted on the moving device, and the control circuit is electrically connected with the moving device, the worktable heater, the thermostats and the temperature sensor respectively; the case is formed by splicing a plurality of metal plates; the thermostats are distributed on the metal plates and electrically connected with the control circuit; the temperature sensor is electrically connected with the control circuit; and the thermostats adopt resistance type heaters. The three-dimensional printer has the advantages of 360-degree constant temperature, high heating speed, small size, simple structure, visible temperature, flexibility of moving members and little moving device load due to separation of a feeder and a spraying head.