The invention discloses a plate-type heat exchanger with heating and refrigerating functions. The plate-type heat exchanger comprises an upper cover plate, first fluid flowing channels, second fluid flowing channels, thermoelectric modules, a lower cover plate and an installing and fastening structure; the upper working face and the lower working face of each thermoelectric module are provided with the corresponding first fluid flowing channel and the corresponding second fluid flowing channel respectively; the upper cover plate is arranged on the uppermost first fluid flowing channel, and the lower cover plate is arranged under the lowermost second fluid flowing channel; all the parts are connected into an integral structure through first fastening holes formed in the upper cover plate, first flowing channel fastening holes, thermoelectric module fastening holes, heat exchanger fastening holes, second flowing channel fastening holes and second fastening holes formed in the lower cover plate. According to the plate-type heat exchanger with the heating and refrigerating functions, two kinds of fluids can be heated and refrigerated at the appropriate temperature; the advantages that the structure is compact and simple, the efficiency is high, the thermoelectric modules are free of moving parts and free from wear, the life is long, and temperature control is precise are achieved; the main parts can be obtained through punch forming, related thermoelectric units do not need to be customized, the production cost is low, and the large-scale application requirements are met.