The invention discloses a preparation method of a laboratory 
reagent bottle label protective film, and relates to the technical field of 
label protective films. Putting the water-based 
flame-retardant treatment agent into deionized water, and heating in a water bath to fully dissolve the water-based 
flame-retardant treatment agent; 
triethanolamine, 
stearic acid and 
isothiazolinone are added, and water bath heating and stirring are continued; heating to melt the white 
wax, and pouring the white 
wax while hot; and adding boiling deionized water, heating and stirring until the substances are completely dissolved, taking down, standing, naturally cooling to 
room temperature, covering and storing in a 
glass container to obtain a prepared finished product. The water-based 
flame-retardant treating agent is used as a 
raw material of the 
label protective film, so that the prepared finished product has good fireproof performance; 
isothiazolinone is added, so that the prepared protective film has a 
mildew-proof effect; and 
stearic acid and 
triethanolamine are added, so that the raw materials are more fully dissolved and emulsified, and the finished product is more uniform. And the prepared finished product is uniform in film formation, fast in film formation and convenient to manufacture, meets the requirements of 
green chemistry, and has obvious 
economic benefits and 
social benefits.