Fiber/powder composite felt and preparation method thereof and vacuum thermal insulation panel

The invention discloses a fiber/powder composite felt and a preparation method thereof and a vacuum thermal insulation panel. The fiber/powder composite felt comprises laminated fiber felt bodies andpowder pressing pieces located between the fiber felt bodies. 20-100 fiber felt bodies are arranged, the powder pressing pieces are laid in the middle of every 1-10 fiber felt bodies, and the powder bodies are formed by hot pressing of powder; and the fiber felt bodies are composed of 90-100 parts of glass fibers and 0-10 parts of hot-melt adhesive fibers, and the powder pressing pieces are composed of 30-60 parts of fumed silica, 40-70 parts of precipitated silica, 0-10 parts of silica powder and 0-10 parts of low-melting-point filler. The fiber/powder composite felt disclosed by the invention not only solves the problem of high rebound rate of a vacuum thermal insulation panel core material, but also has small aperture and high strength. 本发明公开了一种纤维/粉末复合毡，其制备方法以及一种真空绝热板，所述纤维粉末纤维毡包括层叠的纤维毡以及位于所述纤维毡层间的粉末压片；所述纤维毡的数量为