The invention discloses a STP (Standard Temperature and Pressure) ultrathin vacuum insulation panel for a building internal wall, which comprises a composite inorganic fiber core material and a high-barrier composite film. The composite inorganic fiber core material comprises glass fibers, inorganic mineral ultrathin powder, silicon dioxide micro powder and a lightweight heat insulating material; the high-barrier composite film is formed by compounding fiberglass gridding cloth, an aluminium foil, an aluminum laminated film and an organic polymer film. According to the invention, by researching and producing the high-efficiency heat insulating material, on the premise of ensuring energy saving, the dead weight of the thermal insulating material is reduced, resource consumption is reduced and the space occupation rate of the heat insulating material is improved; a heat conductivity coefficient of the vacuum insulation panel is smaller than or equal to 0.008W/(mK) and is 4 to 5 times of that of a conventional heat insulating material; when a heat insulating effect is ensured, the dead weight can be reduced and the sharing area is saved; the reusability of resources further is an effective way of implementing zero energy consumption. Due to the small dead weight and a small thickness, the STP ultrathin vacuum insulation panel is convenient and rapid to construct and construction cost is reduced.