Product features: Three-way catalytic cleaning agent and protecting agent is able to solve such problems as sulfur and phosphor chemical mixture blockage and unsmooth exhaust in catalytic converters. Meanwhile, it also solves the problems of carbon deposition and sludge in combustion chamber, inlet valve, fuel injection nozzle and other positions, thus decreasing vehicle tail gas, nitrogen and oxygen and obviously improving the driving power and cutting fuel consumption so as to resume the activating objective of catalytic converters and prolong its service life.