The invention belongs to the field of external wall 
thermal insulation layers, and particularly relates to a green and energy-saving fire-extinguishing device for a 
thermal insulation layer of a building external wall. The green and energy-saving fire-extinguishing device comprises a housing, a cylinder A, a glass body, a slide plug, a spring A, a cylinder B, a guide base A, a guide base B, a spring B, a slide block A, a spring C, a connecting rod A, a blocking column, an outer sleeve A, an outer sleeve B which is composed of a ball body and a cylinder, a driving lever, a cone, a steel 
wire rope A, a guide base C, a slide block B, a spring D, a fixed 
pulley and a steel 
wire rope B, wherein transmission holes in two side walls of the housing are opposite to spherical surface holes; and thecylinder A with an opening in one end is mounted at a transmission hole outside the housing. The driving lever at an 
ignition point of the outer sleeve B is pulled by the steel 
wire rope A, so that part of water previous holes in the outer sleeve B can swing out of the spherical surface holes only through small-angle deflection, and therefore, a channel which seeps water outwards and is distributed at the periphery of the 
ignition point is quickly opened, and the effect of timely and quickly extinguishing fire or humidifying the 
thermal insulation layer is achieved.