The invention relates to the technical field of electric generation, in particular to a residual heat electric generating system and technology thereof, as well as a power station. The residual heat electric generating system and the technology thereof comprise a first-level low-temperature working substance memory, a first-level pressurizing pump, a hot water waste liquid high-temperature flue gas residual heat exchanger, a first-level low-temperature working substance steam turbine, a first-level low-temperature working substance condenser and a first-level coagulating pump which sequentially communicate in an end-to-end manner; a first medium is a low-temperature medium, and the boiling point of the first medium is not greater than 0 DEG C; an equipment cooling system residual heat collector and an exposed residual heat collector respectively communicate with the first-level pressurizing pump and the first-level low-temperature working substance steam turbine; and an inlet valve and an outlet valve are arranged on the hot water waste liquid high-temperature flue gas residual heat exchanger, an inlet valve and an outlet valve are arranged on the equipment cooling system residual heat collector, and an inlet valve and an outlet valve are arranged on the exposed residual heat collector. The power station comprises the residual heat electric generating system. The invention aims to provide the residual heat electric generating system and the technology thereof, as well as the power station so as to solve the technical problem that in the prior art, the heat quantity of low-temperature residual heat is greatly wasted.