Automatic ore screening machine

The invention discloses an automatic ore screening machine. The automatic ore screening machine comprises a power adapter case, a feeding hopper, a feeding bin, a riffle, an adjusting piece, a first roller, a heating bin, a second roller, a corona combined electrode, a driving motor and a solid particle conveying pump. The feeding bin is located at the top of the case. The adjusting piece is used for adjusting the feeding height, and the situation that materials bounce on the surface of a sorting drum can be avoided. The heating bin is used for heating and dehumidifying the materials, and the materials are effectively prevented from adhering to the surfaces of the rollers. According to the difference between good conductor performance and poor conductor performance of the materials, the materials are separated, intermediate product particles with the conductivity between a conductor and a non-conductor are conveyed back to the case through the solid particle conveying pump and separated through an electric field again, material circulation is achieved, material waste is avoided, meanwhile, an intelligent power adapter is arranged, a standby power supply is arranged, and power supply of a motor cannot be stopped when outage happens.