The invention relates to the technical field of oil exploitation, in particular to a chromium system cross-linking type profile control agent which is formed by mixing the following substances in parts by mass: 5-8 parts of polyacrylamide, 0.2-0.6 part of a dissolution promoter, 0.5-1.5 parts of a stabilizer, 0.5-1.0 part of a cross-linking agent and 90-98 parts of water. According to the chromiumsystem cross-linking type profile control agent, the structure formed by chromium ions is stable, and the application range is wider; the dissolution promoter is added, so that the dissolution speedof all components of the product is increased, the preparation time of the product in the preparation process is greatly shortened, the working efficiency of field work is improved, and meanwhile, theerror rate of the field work can be effectively reduced; the underground profile improvement effect of the injection well is good; meanwhile, the gelatinization time can be controlled by utilizing the temperature, and the product pertinence is high.