NOVELTY - The waste separating machine comprises a magnetic separator including a grain size screen that selects small sized soil and moisture from the waste based on the particle size. The separator separates the ferrous metal material foreign substance from the waste, and rotates the foreign substance using an electric signal. A belt part is operated with the rotation of a driving pulley, where the driving pulley is a drive belt type pulley and arranged in both ends of the belt part. The driving pulley is positioned in a leading end of the belt part. A shaft is axis-installed between the pulleys.    USE - The waste separating machine is useful in a biofuel production equipment to remove foreign substance such as ferrous metal material and sand from wastes.    ADVANTAGE - The waste separating machine removes the foreign substance from the wastes thus achieving the production of the biofuel with high-quality and excellent calorific value.    DETAILED DESCRIPTION - The waste separating machine comprises a magnetic separator including a grain size screen that selects small sized soil and moisture from the waste based on the particle size. The magnetic separator selects the ferrous metal material foreign substance from the waste, and rotates the foreign substance using an electric signal. A belt part is operated with the rotation of a driving pulley, where the driving pulley is a drive belt type pulley and is arranged in both ends of the belt part. The driving pulley is positioned in a leading end of the belt part. A shaft is axis-installed between the pulleys. The pulley is rolled with a circumference of the shaft and maintains the state where the magnetic material is fixed. An inlet port of a ferrous metal material foreign substance input part is formed in a bottom part of an end portion in which the magnetic material is provided. A ferrous metal material foreign substance capture site is installed in a bottom part of the ferrous metal material foreign substance input part. The small soil and moisture are passed through a collecting container. The machine further comprises a vibrator that causes the vibration to move the grain size screen up and down.