The invention discloses a sacral region supporting device of an automobile seat, and relates to the field of automobile seat supporting devices. The thickness and height of the incompressible
solid structure can be adjusted, and the length of the incompressible
solid structure is consistent with the width of a supporting
waist part of the backrest of the seat; the cuboid liquid bag is positioned between the
solid structure and the sacral region of a
human body, can completely cover the
sacrum surface of the
solid structure, is slightly 2-5cm high, is provided with an
electric heating and
temperature control device, is filled with a proper amount of liquid, can be shaped according to the shape of the sacral region, and can display the
volume percentage of the liquid; the upper edge of the liquid bag is fixed to the upper edge of the
solid structure. The scheme has the effects that incompressible solid sufficient support is provided for the
sacrum, the solid supporting force is uniformly dispersed around the
sacrum by the extruded liquid in the liquid bag, and the liquid bag is shaped to adapt to the shape around the sacrum.