The invention discloses a coating process of tent cloth. The coating process is characterized by comprising the following steps: step 1, selecting bottoming base cloth; step 2, carrying out vertical-coating paste coating on front and back surfaces; and step 3, carrying out top-coating paste coating, wherein the specification of the base cloth is 840D*840D/18*18 warp-knitted cloth. In the step of carrying out the vertical-coating paste coating on the front and back surfaces, a vertical-coating paste is used and comprises resin, a plasticizer, a stabilizer, calcium carbonate and a binding agent and the ratio of the resin to the plasticizer to the stabilizer to the calcium carbonate to the binding agent is (40-60) to (28-30) to (1-2) to (20-25) to (2-4); in the step of carrying out the top-coating paste coating, top-coating paste is used and comprises the resin, the plasticizer, the stabilizer and the calcium carbonate, and the ratio of the resin to the plasticizer to the stabilizer to the calcium carbonate is (40-60) to (22-25) to (1-2) to (8-10). The coating process of the tent cloth has a simple process; the product is soft and light, has abundant colors, grams and types, and can be used as a fabric of various outdoor tents and relief tents.