The invention discloses an automobile tail gas waste heat recycler and an automobile tail gas waste heat recycling system. The automobile tail gas waste heat recycler comprises a heat accumulator and an auxiliary hanger for hanging the heat accumulator onto an automobile chassis; the heat accumulator comprises a thermal-insulation housing, a tail gas flow path and a heat recovery working medium region; the tail gas flow path passes through the front surface and the rear surface of the thermal-insulation housing; a tail gas inlet and a tail gas outlet are separately formed in the front surface and the rear surface of the thermal-insulation housing correspondingly; and the auxiliary hanger is arranged on the top of the thermal-insulation housing of the heat accumulator. The recycling system intensively realizes tail gas waste heat collection and power generation of automobile collector-distributor points by combining the automobile tail gas waste heat recycler, an assembling and disassembling structure, at least one group of transmission assembly lines and waste heat utilization ends. The intensively-utilized waste heat collection points and the waste heat utilization ends are arranged at the two ends of an automobile flow dynamic balance area, and the application field is expanded in a manner of separating the automobile tail gas waste heat collection ends from the utilization ends, so that using efficiency is improved.