The invention discloses a wet non-
woven fabric for a 
water treatment reverse osmosis membrane supporting body base material and a preparation method, main body fibers and hot melting bonding fibers are used as 
raw material fibers, and the main body fibers are made of PET; the hot-melt 
adhesive fiber comprises a 
surface layer and an inner core, the 
surface layer is made of modified COPET, and the inner core is made of PET. A wet non-
woven fabric process is adopted, the base material non-
woven fabric is formed into a whole through 
fiber dispersion, inclined wire 
papermaking forming, 
drying cylinder 
drying and off-line 
machine external hot melting rolling, the whole base material non-woven fabric is of a single-layer structure, and the prepared base material non-woven fabric needs to have good 
surface coating performance and good 
coating liquid permeability and cannot permeate to the non-
coating surface of the base material non-woven fabric. According to the invention, by adopting a 
distributed control system, the method has the characteristics of good product quality 
controllability, stable performances of the finished product, simple and reasonable operation of the preparation process flow, easiness in operation, 
energy conservation and consumption reduction, and can meet the requirements of 
reverse osmosis membrane production.