The cold core box core shooting machine can be equipped with a sand regeneration system to recycle and reuse used sand. The old sand regeneration is to send the cast sand into the sand recycling and regeneration system, and then send it to the vibration crusher through the conveyor. After crushing and screening, it is sent to the eddy current rubbing and recycling machine by the hoist, and through a series of crushing and rubbing. The binder film on the surface of the sand is separated from the sand, and the grain size of the sand can be adjusted. The dust in the recycled sand is removed by the dust removal system, making it very economical to replace the new sand. The recycling of old sand can greatly save the cost of new sand input and the disposal of old sand, transportation and site. The regenerated sand has uniformity, smooth surface and good thermal stability, which is beneficial to improve the quality of castings, especially to reduce the amount of resin added, reduce the cost, and reduce the environmental pollution caused by the waste sand.