Water-based cleaning agent

The invention discloses a water-based cleaning agent, which comprises the following components in percentage by mass: 1 to 3 percent of sodium tripolyphosphate, 2 to 4 percent of disodium hydrogen phosphate, 0.5 to 1 percent of borax, 2 to 4 percent of nitrobenzoic acid, 0.5 to 2 percent of sodium hydroxide, 1 to 4 percent of surfactant, 2 to 5 percent of polyethylene glycol, 13 to 15 percent of triethanolamine, 0.01 to 0.1 percent of defoamer and the balance of water. The water-based cleaning agent is high in cleaning capacity of greasy dirt, avoids generating a large amount of foam in the cleaning process, is suitable for full-automatic cleaning and ultrasonic cleaning, has the good protective effect on cleaning machines, does not contain inflammable and explosive ingredients, is used safely, does not have influence on human bodies and does not pollution on environment.