Plate heat exchanger heat preservation device capable of being rapidly disassembled and assembled

The utility model relates to the technical field of heat exchangers, in particular to a plate heat exchanger heat preservation device fast to disassemble and assemble. Comprising a cover plate, side plates, a fixed plate and a movable plate. Each assembly is made of a stainless steel plate, the inner surface of each plate is adhered with a thermal insulation layer, and the thickness is adjusted according to the size of the plate heat exchanger; the heat preservation layer is made of B1-grade rubber and plastic sponge; hasp assemblies are arranged on the periphery of the upper portion of the box body structure, two sets of hasp assemblies are arranged between the fixed plates so that the box body structure can be conveniently disassembled and assembled, limiting assemblies are arranged on the front portion and the rear portion of the box body structure, and each limiting assembly is composed of a corner brace with the two sides fixed to the corresponding side plate, a corner brace fixed to the corresponding mo