The invention relates to a thermal partition for vehicles having a refrigerated loading zone (4), said thermal partition comprising: a lightweight and durable support frame (1), and a thermal mat (2) attached to one of the surfaces of the frame (1). The top of the frame (1) is equipped with hinges (14) supporting rolling bearings (15) allowing the thermal partition to move longitudinally along longitudinal guides (41) attached to the ceiling of the vehicle loading zone (4) and allowing the thermal partition to be moved between a vertical use position, in which it separates the loading zone (4), and a horizontal non-use position, in which it is positioned alongside the ceiling of the loading zone (4). The sides of the frame (1) are equipped with spring pull elements (16) for securing the frame, in the vertical use position, to side load-securing guides (42) disposed on the sides of the vehicle loading zone (4).