The invention discloses a liquid soldering flux for soldering electrical products, which is characterized by being prepared from the following raw materials in percentage by weight: 70-85 percent of ethanol, 2.0-5.0 percent of ethylene glycol monobutyl ether, 1.0-4.0 percent of mixed acid with the volume ratio of hydrochloric acid to phosphoric acid of 2:1, 10-20 percent of colophony, 0.5-2.0 percent of benzotriazole and 0.5-3.0 percent of glycerol stearate. The liquid soldering flux for soldering the electrical products is prepared by the following steps of: respectively placing the components in a container for sufficiently mixing, heating in a water bath for 3h, keeping a temperature of 40-50 DEG C, and stirring and mixing to be uniform while heating; and naturally cooling to the room temperature. The liquid soldering flux is coated on an electric appliance wiring terminal so that a soldering surface is rapidly activated, a copper conductor is soldered on an activated surface of a large electric appliance wiring terminal by an electric soldering iron through soldering tin, thus a firm, smooth and bright soldered dot can be obtained, and the oxidation of the surface of the electric appliance wiring terminal is avoided. The soldered dot can keep firm, smooth and bright for a long time, and the quality of an electric appliance wiring product is ensured.