The invention provides a process for preparing ultrafine calcium carbonate in a wet-method grinding way, which relates to the technical field of fine chemical industry. The process comprises the following steps: (1) transporting calcite to a jaw crusher by virtue of a transporting machine, roughly crushing the calcite, enabling the crushed calcite to enter a raymond mill to be finely crushed, filtering the finely crushed calcite, removing iron by virtue of an iron removal device, and obtaining dry powder; (2) adding water, diethylene glycol and front-stage dispersant, controlling the rotationspeed at 100 to 300 r / min, mixing for 10 to 20 min, adding the dry powder, increasing the rotation speed to 1000 to 1200 r / min, mixing for 20 to 40 min, transferring the mixed slurry into a grinding machine, wherein a ball-material ratio is 3:1, a grinding medium is grinding zirconium balls, after beginning the grinding, supplementing the front end dispersant one time every 30 minutes, grinding for 2 hours, then adding a rear dispersant and a PH adjusting agent, wherein the addition amount of the rear-stage dispersant is 0.4 to 0.5 percent of the weight of the calcite, and continuously grinding for 100 to 120 min; and (3) discharging, washing, drying, thus obtaining a finished product. By adopting the process, the agglomeration phenomenon in the production process of the ultrafine calciumcarbonate can be effectively solved, and the production scale can be increased.