The invention discloses a high-efficiency catalytic processor for automobile and engine exhaust emission, belongs to the technical field of automobile exhaust pollutant emission reduction, and solves the problem of poor low-temperature exhaust catalysis treatment effect. An accumulator heat exchanger is integrated with the catalytic processor, a gas cylinder (3) is clamped between an inner accumulator heat exchange cylinder (4) and an outer accumulator heat exchange cylinder (2), a cellular packing material body (12) and an electric heater sleeve (11) are placed in the gas cylinder (3), catalysts coat the cellular packing material body (12), corrugated plate finned packing materials (9) and phase change accumulator materials are mounted in the inner accumulator heat exchange cylinder (4) and the outer accumulator heat exchange cylinder (2), electric heaters (13) are placed in the electric heater sleeve (11), and the high-efficiency catalytic processor further comprises a temperature controller (25). Automobile and engine exhaust emission can reach the optimum temperature, catalyst exhaust treatment effects can be greatly improved particularly for cold start, pollution is decreased, and the high-efficiency catalytic processor is small in size and easy to manufacture, mount and maintain.