The embodiment of the invention provides a supporting and a shape-regulating device for a reflector of a heliostat, which relates to the solar field. Said device is installed on the back of said reflector of said heliostat and fixed with a support of said heliostat, said supporting and shape-regulating device comprises a shape-regulating part for adjusting the curvature of said reflector and an adjusting part for adjusting the pitch and angle of said reflector; said shape-regulating part comprises at least four shape-regulating components, wherein at least one shape-regulating component is installed on a central sleeve of connection claws in the center of said reflector, the others are installed on the edge of said reflector and connected respectively with said central sleeve of connection claws through respective supporting arms of connection claws, said shape-regulating components comprise suckers and adjustable fasteners; said adjusting part is set up correspondingly on the side part of said center sleeve of connection claw, said adjusting part comprises a transition part and an adjusting fastener, said transition part is fixed with said support, said adjusting fastener is set up between said transition part and said center sleeve of connection claw. Thus, the invention has a simple structure and good adjusting effect, it is convenient to adjust, and easy to process and manufacture.