A portable one-piece therapeutical apparatus with dual heating and low-frequency treatment functions includes a main unit having an accommodating space and a patch portion a control means installed in the accommodating space and including a printed circuit board assembly with an operating component for controlling low-frequency pulses and a heating operation, an electrical connector installed at the front of the printed circuit board assembly for charging a battery and reading, writing and transmitting data at least one heating means installed at the main unit and electrically coupled to the printed circuit board assembly for producing a heating effect at least one low-frequency electrode layer disposed under the patch portion and electrically coupled to the printed circuit board assembly for transmitting low-frequency pulses and a battery installed in the accommodating space and directly and electrically coupled to the printed circuit board assembly for supplying power to the patch therapeutical apparatus.