The invention discloses a car cleaning and maintenance liquid, and solves the problems that car cleaning agents in the prior art are single in function, easy to cause environmental pollution, inconvenient to use and high in water consumption. The car cleaning and maintenance liquid comprises the following components: by weight, 50-80 parts of water, 10-15 parts of saponin, 5-10 parts of white oil, 20-30 parts of palm wax, 5-10 parts of heterogeneous alcohol polyoxyethylene polyoxypropylene ether, 10-15 parts of silicon fluorine modified acrylate resin, 3-8 parts of polyvinylpyrrolidone and 1-5 parts of sodium diethylhexyl sulfosuccinate. The car cleaning and maintenance liquid gathers decontamination, polishing, waxing and mark eliminating functions in one, is rapid in decontamination, good in use effect, can make the car body paint surface maintain bright for a long time, is mild in property, may not hurt the skin, has easily decomposed components, and is good in freezing performance, convenient to use and low in water consumption.