Mobile crushing plant is a kind of wheel type mobile stone crusher plant. It combines vibrating feeder, jaw crusher, cone / impact crusher, vibrating screen on one truck body to crush and screen gravels automatically. This four-in-one crushing plant is reasonable circular crushing system to crush stone in higher efficiency. When mobile stone crusher plant works, material by the feeder goes evenly to the jaw crusher. After primary crushing by jaw crusher, stone goes to vibrating screen by main belt conveyor. During screening, the first layer unqualified material goes into secondary crusher to break. The qualified material from other screen layers are discharged to finished material area. The output from secondary crusher is discharged to main belt conveyor for further screening too. Thus, the material is in the circulation system of crushing-screening-crushing. The finished material could meet the final demand greatly.