The present invention discloses a fabric water repellent agent, which comprises paraffin, ozocerite, gelatin, caustic soda flakes, peregal, glacial acetic acid, soap, colophony, aluminum sulfate, water and camphor. The fabric water repellent agent has the following beneficial effects that: a treatment process is simple, wherein results of treatment tests on a plurality of canopy cover clothes and fabrics show that color, quality and air permeability of the fabric are not changed; the fabric has characteristics of no mold, no softening at a high temperature, no bonding and good air permeability; after the fabric is longitudinally and laterally folded more than 23 times, characteristics of not cracking, no peeling of complex membrane, softness and no stiffening are provided; and various fabrics treated by the fabric water repellent agent do not cause harm to human bodies. In addition, the fabric water repellent agent has characteristics of low production cost, strong practicality and generalization values.