The invention discloses a waterproof dry-mixed mortar in the technical field of mortar production and a production process thereof, which comprises the following powder, and the components are calculated by weight percentage: 40%-60% of ordinary Portland cement, 30%-50% of mixed sand %, redispersible polymer rubber powder 1%-1.5%, silicone waterproofing agent 0.2%-1.2%, fiber 0%-0.3%, water-retaining thickener 0.6%-1.5%, and the balance is admixture; and It is prepared by the following process: screen the components of the mixed sand through a sieving device, measure and mix them according to the proportion; mix starch ether, cellulose ether and bentonite according to the proportion to obtain a water-retaining thickener; ordinary silicate Cement, mixed sand after screening and mixing, redispersible polymer rubber powder, silicone waterproofing agent, fiber, water-retaining thickener, and additives are measured and mixed according to the proportion to prepare a dry mix; the dry mix is dispersed and packaged as Finished product; the present invention improves the various performances of the mortar, can save a certain cost of raw materials, facilitates construction, has excellent waterproof performance and anti-cracking performance, and has good durability.