The invention discloses an external window heat insulation air collector. The external window heat insulation air collector comprises air collector bodies mounted on the outer side of a window of a building external wall. The air collector bodies are arranged in pairs and movably installed. The air collector bodies can be moved in front of the window. Each heat collector body comprises a heat collection box made of a thermal insulation material, wherein a light pervious thermal insulating layer is mounted on one side face of the heat collection box, and a heat storage and release layer is arranged in the heat collection box; the light pervious thermal insulating layer is symmetrically provided with first vent ports and second vent ports. A first ventilation opening and a second ventilationopening are symmetrically arranged in the positions, located on the upper and lower sides of the window, of the building external wall. The first vent ports and the second vent ports communicate withthe first ventilation opening and the second ventilation opening correspondingly. The external window heat insulation air collector integrates the functions of heat preservation, thermal insulation,heat storage, ventilation and sunshading, as the technical problems that a glass external window is poor in thermal insulation and ventilation performance and cannot achieve the sunshading and thermalinsulation effect and the solar radiation effect simultaneously are solved.