The invention relates to a self-adhesion elastic bandage easy to tear and a manufacturing method of the elastic bandage. A non-woven layer is coated with an adhesive layer, and then laminated with a polyurethane filament layer in a tensional state and a cotton gauze layer to form a bandage substrate, and the front side and the back side of the bandage substrate are each provided with an adhesive layer in a pad-roll mode; a non-woven fabric refers to a spunbond polypropylene non-woven fabric, and the gram weight of the fabric is 8-15 g/m<2>; the polyurethane filament of a 60D-120D specification is adopted, and the warp density of the polyurethane filament is 7-11 pieces per inch; the warp density of the cotton gauze is 15-20 pieces per inch, the weft density of the cotton gauze is 8-18 pieces per inch, and the number of yarn is 30-40 S. The self-adhesion elastic bandage is easy to tear in the horizontal and longitudinal directions, the tearing surface is clear and neat, convenience is provided for broad users, and the skew phenomenon cannot occur.