The invention provides an antibacterial anti-slip biaxially stretched 
polyester film and a preparation method thereof. The film comprises a 
surface layer and a core layer, wherein the 
surface layer Ais a functional layer, the core layer B is a 
colored layer and / or a transparent layer, the 
mass fraction of the 
surface layer is 15%-25%, the 
mass fraction of the core layer is 75%-85%, and an 
antibacterial agent is added in the surface layer A and / or the core layer B. When the film is prepared, in a transverse stretching process, the 
shrinkage rate of the winding film is further reduced through an improved cross-drawing process, so that the product has a more excellent 
shrinkage rate while having a good antibacterial anti-slip effect. The film is prepared by adopting three-layer co-extrusionbiaxial stretching equipment, and the 
polyester film is obtained through the steps of 
melt extrusion through a twin-screw extruder, piece 
casting through 
cold blast, longitudinal stretching, transverse stretching, traction and winding, 
cutting, packaging, finishing and the like. The produced film has an excellent 
antibacterial effect, has an anti-slip 
friction coefficient of 0.75-0.85, and has very good anti-slip performance. In addition, the 
polyester film prepared by the method has the advantages of being simple in method and low in cost, and having a good market application prospect.