The invention discloses a polyimide film with high dimensional stability and a preparation method of the polyimide film. The polyimide film is prepared from at least one aromatic dianhydride containing a rigid structure and at least one aromatic diamine containing a rigid structure through a solution polycondensation reaction and an imidization reaction, wherein the sum of mole numbers of the aromatic dianhydride containing the rigid structure and the aromatic diamine containing the rigid structure accounts for 70-85% of the sum of mole numbers of totally reacted dianhydrides and diamines; the film thickness is 5-75 microns; the thermal shrinkage ratios of the film in the longitudinal direction and the transverse direction are respectively less than or equal to 0.1%; the coefficient of linear thermal expansion is less than or equal to 16ppm; and the operating requirements of a polyimide film base material of a flexible copper clad laminate are met. According to the preparation process of the film, a roll-to-roll production manner of performing continuous longitudinal stretching technology according to a constant speed ratio and transverse high-temperature stretching and online thermosetting treatment is adopted, the prepared polyimide film has excellent dimensional stability performance, and the production manner adopted by the film is simple, convenient, high-efficiency and reliable.