The invention discloses a device for matter heat separation of a solid fuel and fused salt integrated boiler. The device is mainly composed of an expansion groove, fused salt grooves, fused salt guide pipes, an insulating layer, a burning cavity, an air preheating recoverer, an air blower, another air blower, a centrifugal fan, circulation burning pipes, a waste heat recovery water tank, a combustion air cavity, a fuel preheating coil pipe, a high pressure plunger pump, a steam coil pipe, a steam header, a steam generator main body, a high pressure spraying device, a desulfurization and denitrification device, a dedusting lime water pool, a spraying head, a circulation water pump, an induced draft fan, a chimney, a solid matter conveyor, a liquid matter conveyor, a matter decomposing coil pipe, a cyclone separation tower, a decomposing reduction chamber and a cooling tower. The device has the beneficial effects that fused salt of a fused salt constant temperature system is directly heated in a hearth, and the steam pipe temperature and the heat decomposing pipe temperature are controlled by heat of the fused salt; jet fog enters a steam pipe to obtain steam; and materials enter a heat decomposing pipe to conduct matter decomposing. The device further has the beneficial effects that a steam decomposing and separating technology is adopted for replacing an existing decomposing and separating technology, and the problems of complex technological processes, equipment and the like are solved.