The invention relates to the technical field of coatings of heat exchangers and in particular to a waterproof heat-isolating coating for a plate heat exchanger and a production process thereof. The heat exchange material is prepared from the following raw materials in parts by weight: 15-20 parts of organic montmorillonite, 1-3 parts of lauryl sodium sulfate, 2-4 parts of benzoyl peroxide, 1-4 parts of styrene, 2-5 parts of an acrylate emulsion, 4-7 parts of natural rubber, 2-5 parts of tributyl phosphate, 3-7 parts of acrylamide, 1-4 parts of vinyl acetate, 1-3 parts of butyl acrylate, 0.5-2.5 parts of methyl methacrylate, 0.2-1 part of a silane coupling agent, 0.5-1 part of a defoamer and a proper amount of water. According to the technical scheme provided by the invention, defects that the heat-resistant stability is poor, the flame retardance is poor and the like can be overcome.