Coal tar cleaning agent

The invention discloses a coal tar cleaning agent. The coal tar cleaning agent is mainly used for cleaning coal tar dirt generated in the machining process of an aircraft brake pad. The coal tar cleaning agent is prepared by mixing, by weight, 20-40% of dichloromethane, 10-30% of tetrafluoroethylene, 10-30% of d40 detergent solvent naphtha, 3-20% of methylpyrrolidone, 3-20% of ethyl alcohol and 10-20% of ethylene glycol butyl ether. The cleaning rate of the cleaning agent for coal tar dirt generated in the machining process of the aircraft brake pad reaches 98% or above, the dirt is basicallycleaned thoroughly, the cleaning time is short; the flash point is high, ignition is not likely to be performed, explosion is not caused, and the security of operation of workers is improved; the cleaning agent can make direct contact with skin, no harm is caused to the human body basically, no pungent smell is generated, and the worker cleaning environment is improved.