The invention relates to a low-friction-coefficient antiblocking smooth 
coating and a preparation method thereof. The low-friction-coefficient antiblocking smooth 
coating contains the following components in parts by weight: 90-110 parts of 
styrene-acrylic 
emulsion, 15-25 parts of 
ion exchange silica 
sol, 10-15 parts of large-particle-size silica 
sol, 15-25 parts of water, 30-50 parts of 
ethanol, 2-4 parts of n-butyl 
alcohol and 0.4-0.6 part of 
sodium polystyrene sulfonate. The preparation method comprises the following steps: a, by taking 
styrene-acrylic 
emulsion with the pH value of 8-9 as a base material, slowly 
doping silica 
sol, stirring for 1 hour at a rotating speed of 500rpm, and uniformly mixing materials; b, then adding 
mixed solution of water and 
ethanol, slowly adding a n-butyl 
alcohol defoaming agent, and stirring for 20 minutes at a 
low speed; and c, finally adding water diluted solution of 
sodium polystyrene sulfonate, stirring for 10 minutes at a 
low speed, then filtering by virtue of a 300-mesh filter net, standing, and defoaming for later use. Therefore, the 
coating has multiple advantages of antistatic property, antiblocking property, good 
weather resistance, high printing color density, low flexibility and improved paper feeding passing rate of a printing medium, the coating is easy to process and manufacture, and 
batch production can be carried out.