The invention relates to the field of paint removers, and discloses a paint remover and a preparation method thereof, and a paint removing method. The paint remover is prepared from the following components in parts by mass: 20 to 80 parts of ether, 10 to 60 parts of alcohol, 1 to 40 parts of inorganic alkali, 0.1 to 10 parts of a volatile inhibitor, 0.1 to 10 parts of a corrosion inhibitor, 0.1 to 5 parts of a surfactant and 0.1 to 4 parts of a thickening agent. The preparation method of the paint remover comprises the following steps: mixing the inorganic alkali, the ether, the alcohol, thevolatile inhibitor, the corrosion inhibitor, the surfactant and the thickening agent, and uniformly stirring to obtain the paint remover. According to the invention, the paint remover is low in toxicity, environmentally friendly, high in paint removing speed and good in paint removing effect, can avoid corrosion on metal base materials, improve the rust resistance of iron materials, improve the painting adhesive force of iron materials and effectively remove phenolic aldehyde paint films, alkyd paint films, nitro paint films, polyurethane paint films, epoxy resin paint films, water-based paintfilms and electrostatic powder paint films.