The invention discloses a low-
precipitation polyester film which is prepared from the following raw materials in parts by
mass: 95-100 parts of low-
precipitation polyester chips and 0-5 parts of an anti-blocking agent, wherein the two surfaces of the low-
precipitation polyester film are coated with the same or different
coating liquids. The preparation method of the low-precipitation polyester chips comprises the following steps: mixing
terephthalic acid and
ethylene glycol according to a
molar ratio of 1:(1.1-2.0), and adding an auxiliary agent for
polymerization, wherein the esterification temperature is 220-260 DEG C and the polycondensation temperature is 260-290 DEG C; when the
viscosity of the sample is between 0.40 dL / g and 0.55 dL / g, ending the reaction to obtain a
copolyester melt; and conducting extruding to form strips by using
nitrogen, condcuting granulating to obtain slices, carrying out
solid-phase polycondensation on the slices, and ending the reaction when the
viscosity of a sample is 0.60-0.80 dL / g to obtain the low-precipitation polyester chips. The invention also discloses a preparation method of the low-precipitation polyester film. The low-precipitation polyester film prepared by the invention has better
thermal stability and low precipitation property, the
haze is lower than 1%, and meanwhile, the
haze rising value is less than 0.5% after the film is heated for 2 hours at 150 DEG C, so that the phenomenon of atomization is avoided when the film is heated.