The invention discloses wiping liquid for clearing away weapon shooting residues and a preparation method of the wiping liquid. According to the wiping liquid, water and ethylene glycol are used as basic liquid to serve as a carrier and provide certain viscosity, and serve as a viscosity index adjusting agent; sodium nitrite is a metal passivating agent; ammonium carbonate is a copper ion activating agent; ethylene glycol monoethyl ether is a dissolving agent which can be used for dissolving nylon residues and gunpowder residues; sodium tetraborate is a pH adjusting agent; a nano-ceramic material is a friction agent; and under the effects of a surface active agent, in combination with the nano-ceramic material and dimethyl sulfoxide, the wiping liquid with extremely strong infiltration capacity and stable performance is obtained. The wiping liquid can be used for effectively clearing away the gunpowder residues and copper and aluminum residues in a shooting weapon inner cavity, and hasno corroding effect on the inner cavity, and the corrosion resisting capacity of the inner cavity is improved.