The present application provides not only a heating device (141) for additive manufacturing but also a heating module and a manufacturing apparatus (1) utilizing the heating device (141). The heating device (141) utilizes a rotational reflective cover (1414) to modulate a heating direction of a heating source (1415), which expands an area correspondingly irradiated by the heating source (1415) and enhances uniformity of heating. Besides, the heating modules (14A, 14B, 14C) can be coupled and controlled by a controlling subsystem so as to respectively irradiate different areas with ranges at least partially intersecting each other, which also improves heating uniformity for heating a large area.