The invention discloses a superheated steam generator. The superheated steam generator comprises a steam generation furnace body with a chimney; a heating coil is arranged in a hearth of the furnace body; one end of the heating coil is externally connected with a water inlet pipe, and the other end is externally connected with a steam separator; steam of the steam separator is connected to a steam coil in a superheater by a steam pipe with a valve, and is connected out of a superheated steam pipe after being heated by the steam coil in the superheater; upper and lower smoke heating channels are formed in a heating cavity of the superheater, wherein an upper smoke heating channel port is communicated to the upper part of the hearth of the furnace body through the upper smoke channel, and a lower smoke heating channel port is communicated to the lower part of the hearth of the furnace body through the lower smoke channel; the heating coil arranged in the furnace body is divided into upper and lower two sections namely an upper heating coil and a lower heating coil communicated with each other; the upper heating coil is positioned at the upper part of the hearth of the furnace body; the lower heating coil is positioned in a flame heating place at the lower part of the hearth of the furnace body; and a water outlet pipe port is externally connected to the steam separator.