The invention relates to the field of belt type magnetic separating machines, in particular to a graded belt type magnetic separating device. The graded belt type magnetic separating device comprisesa scavenging mechanism and a magnetic screening mechanism; the scavenging mechanism is located below the magnetic screening mechanism, the scavenging mechanism and the magnetic screening mechanism each have the magnetic separating function, the magnetic screening mechanism is provided with a magnetic separating belt, meshes are formed in the magnetic separating belt. The device is simple in structure, the screening device and the magnetic separating device are organically combined, through the meshes, graded screening of mineral particles with different sizes can be achieved, the screening speed and the screening precision are improved, and the mutual interference in the magnetic separating process due to mixing of large and small particles can be effectively avoided, the magnetic separating belt with the meshes is adopted to carry out graded magnetic separation on the minercal particles, the magnetic separating machine and the screening machine are combined into a whole, the cost is lower, occupied area of the device is reduced, and usability and practicability of the device are improved.