The invention discloses a diamond polishing film production method and belongs to the technical fields of grinding materials and grinding tools. The diamond polishing film production method includes that diamond micro-powder is scattered to a binding agent and the surface of a basal film is coated, wherein the diamond micro-powder is washed before scattering till pH (potential of hydrogen) value of washing liquid reaches more than 6.0. The pH value of the surface of diamond is controlled to be near neutral or neutral through washing, binding strength of the diamond micro-powder and the binding agent can be greatly improved, the diamond micro-powder on the polishing film is less prone to falling off during use, and service life of the polishing film can be prolonged.