The invention belongs to the technical field of sorting devices, and particularly relates to a sorting device for a plate production line. A floating chamber is connected upwards with an inner cavity of a cyclone separator and connected downwards with a thick shaving outlet, an air outlet at the top end of the cyclone separator is connected with a fan, and the bottom end of the cyclone separator is connected downwards with a thin shaving outlet. The sorting device solves the problem that obtained thickness uniformities of sorted shavings are inconsistent in the prior art and has the advantages of high practicability and self-maintenance function, good sorting effect and high safety.