The present invention discloses a
thermal insulation and sound absorption structure of a building external wall. The structure comprises a wall body, a rock
wool layer is disposed at an inner wall of the wall body while a reflection-type thermal insulating layer is disposed at an outer wall of the wall body, the rock
wool layer and the wall body are fixed by building expansion anchors disposed therebetween, a waterproof
mortar layer is disposed at the other side of the rock
wool layer, the reflection-type thermal insulating layer and the wall body are bonded through a bonding layer, a protective layer is disposed at the other side of the reflection-type thermal insulating layer, the reflection-type thermal insulating layer is composed of
aluminum foil plates and elastic glue sticks, the
aluminum foil plates are folded to be wave-shaped or zigzag, each top part of the
aluminum foil plates is attached with one elastic
glue stick so as to form the reflection-type thermal insulating layer, the elastic glue sticks are high-elasticity
polyurethane rubber wear-resisting buffering stick pins, and the
diameter and length of the elastic glue sticks are defined according to the shape of the aluminum foil plates. Under the condition of meeting strength requirements of the outer wall, the wall body has excellent inflaming-retarding and heat-shielding performance, noises in an outer wall environment are isolated at the same time, and within a certain cost range, the building outer wall can have a special functional performance.