Sand screening equipment for sand dryer

The invention relates to the field of sand drying machines, in particular to sand screening equipment for a sand drying machine, which comprises a sand drying machine provided with a sand outlet pipe, and is characterized by further comprising a sand screening plate, a rotary swing mechanism, a collision plate, a discharge blocking mechanism, a vibration knocking mechanism and two sliding sand blocking mechanisms. A sand screening plate rotating and swinging mechanism and a collision plate are combined, then sand is filtered, a sliding sand blocking mechanism can be blocked through a blocking and discharging mechanism, large sand and stones can slide along the downwards-inclined sand screening plate to be discharged into a collecting box, and then automatic cleaning of the sand and stones is completed; in order to prevent large sand from covering a large amount of sand when the sand screening plate inclines downwards, the vibration knocking mechanism knocks and vibrates the sand screening plate rotating downw