The invention provides a phosphatized cold-rolled strip steel and a manufacturing method thereof. The phosphatized cold-rolled strip steel is composed of, by mass: 0.01-0.10% of C, 0.1-0.6% of Mn, less than or equal to 0.10% of Si, less than or equal to 0.10% of Al, less than or equal to 0.02% of P, less than or equal to 0.015% of S, and the balance Fe and impurity elements. Phosphating treatmentequipment is additionally arranged between a leveling straightening machine and an oiling machine of a continuous annealing unit; the phosphating treatment equipment consists of a phosphating section,a rinsing section and a drying box; after the strip steel is uncoiled, the strip steel enters a phosphating treatment area after being subjected to conventional treatment such as welding, cleaning, annealing, flattening and tension straightening; and the strip steel after the phosphating treatment is directly coiled into a coil without oiling. According to production of the cold-rolled phosphatized coil, the production process of the client side is simplified, the efficiency is improved, the phosphating quality is improved, and the problem that the phosphating effect is influenced due to unthorough degreasing and cleaning of the client terminal is solved.