Treatment method of waste sintered neodymium-iron-boron magnet

The invention provides a treatment method of a waste sintered neodymium-iron-boron magnet. The preparation method comprises the following steps: sequentially carrying out oil removal treatment and vibration grinding treatment on the waste sintered neodymium-iron-boron magnet to obtain a pretreated waste material; mixing the pretreated waste material with a neodymium-iron-boron magnet raw material to obtain a mixture; the mixed material is subjected to vacuum melting and sheet throwing, and a neodymium iron boron alloy sheet is obtained; carrying out hydrogen decrepitation treatment on the neodymium-iron-boron alloy sheet to obtain coarse powder; mixing the coarse powder with an antioxidant, and then grinding through an airflow mill to obtain fine powder; mixing the fine powder with an additive to obtain modified powder; the modified powder is subjected to orientation and pressing treatment, and a neodymium iron boron pressed blank is obtained; performing isostatic pressing treatment on the neodymium-iron-boro