The invention discloses a diffusion absorption type thermal converter. The diffusion absorption type thermal converter comprises a generator, a lifting pipe, a first gas-liquid separator, a rectifying device, a condenser, a second gas-liquid separator, an evaporator, an absorber, a liquid reservoir, a heat regenerator and a fan which are sequentially connected. In the invention, a thermally driven gas bubble pump is adopted to realize simultaneous pumping of an absorbent solution and a refrigerant liquid, and no mechanical solution pump or refrigerant pump is required, thus the structure of the thermal converter is greatly simplified, precious electric energy is saved, and the operation reliability is improved. The thermal converter disclosed by the invention is especially applicable to occasions in which low and medium temperature thermal resources are rich and high temperature thermal resource is required, thus the thermal converter has a good application prospect.