The present invention relates to a rhombus-shaped multilayered multifold heat-insulating panel. The purpose of the present invention is to provide a rhombus-shaped multilayered multifold heat-insulating panel that makes it easy to improve an already-constructed vinyl greenhouse into a vinyl greenhouse having an air layer with a multilayered structure. To this end, the present invention provides a rhombus-shaped multilayered multifold heat-insulating panel characterized by comprising: an insertion panel comprising a first panel portion having a triangular planar structure, a second panel portion which is configured in the same triangular planar structure as that of the first panel portion, and which faces and is coupled to the first panel portion such that a sealed air layer is formed between the first panel portion and the second panel portion, and a third panel portion installed between the first and second panel portions such that the air layer formed between the first and second panel portions is split into two； and a containing body comprising a first pocket portion and a second pocket portion having triangular structures such that the insertion panel is inserted and contained therein, the first and second pocket portions being connected to be symmetric with each other, thereby constituting an overall shape of a rhombus, the containing body being attached inside a vinyl greenhouse with at least one insertion panel contained in each of the pocket portions.La présente invention concerne un panneau thermiquement isolant à plis multiples multicouche de forme rhomboédrique. L'objet de la présente invention est d'obtenir un panneau thermiquement isolant à plis multiples multicouche de forme rhomboédrique qui facilite l'amélioration d'une serre en vinyle déjà construite en une serre en vinyle présentant une couche d'air ayant une structure multicouche. À cette fin, la présente invention concerne un panneau thermiquement isolant à plis multiples multicouche de forme rho
