The invention discloses a phosphorization and phosphorization deslagging integrated device and process. The device comprises a main tank body, a conical tank bottom, an overflow tank, a filtering device, a liquid inlet and a liquid outlet, wherein the main tank body is positioned above the conical tank bottom; the liquid outlet is formed in the conical tank bottom; the overflow tank is arranged at one side of the main tank body; the liquid inlet is formed in the other side of the main tank body; and the filtering device is arranged at the lower part in the main tank body. The process comprises the steps of on-line checking, oil removal, washing, rust removal, washing, neutralizing, washing, surface adjustment, phosphorization, washing, washing, sealing treatment and drying. The phosphorization treatment in the phosphorization process step comprises the step of tank building, parameter test, adjustment of a phosphorization liquid and control and clearing of sediments. The device and the process are used for coating flow line production, so that phosphorization and deslagging integration is realized, and therefore, the device and process are novel.