The invention provides an unconventional reservoir horizontal well crack reservoir controlling volume fracturing well completion method, and belongs to the field of oil and gas exploitation. The method adheres to the concept of geologic reservoir, fracturing transformation and mining mode integration, by shortening the cluster spacing, increasing the cracking density and improving the sand addingstrength, stratum switching without stopping of a pump is achieved through long-acting temporary plugging, 100% of perforation clusters are opened through pressing, bridge plugs are reduced or even avoided, crack reservoir controlling is enhanced, energy supplementing is achieved, and imbibition displacement is synchronized. By means of a crack control matrix unit, all reserves can be mined, the driving pressure difference required by oil gas in a matrix is greatly reduced, and available reserves are greatly increased.