Occult blood detection film, and preparation method therefor and use thereof and occult blood detection kit

A preparation method for an occult blood detection film, which is for occult blood detection, the method comprising the following steps:

• providing a base plate assembly comprising a base plate and a first lubricant disposed on the base plate;
• placing a film-forming solution of a polyionic film on the base plate assembly, and
• putting a cover plate with a second lubricant on the film-forming solution,
• wherein the film-forming solution is in contact with the first lubricant and the second lubricant, respectively;
• and separating the polyionic film from the base plate assembly and the cover plate after a polymerization reaction of various raw materials in the film-forming solution to obtain the polyionic film;
• immersing the polyionic film in a dye solution and making a dye attached to the polyionic film to obtain an occult blood detection film;
• wherein the dye reacts with hemoglobin, and the color of the dye is different in environments with different hemoglobin concentrations, and the dye comprises at least one of a methylene blue dye or a procyanidin dye.