The invention relates to the technical field of battery preparation, in particular to a preparation method of a lithium ion battery material lithium vanadate. According to the method, vanadium pentoxide and a lithium source are mixed uniformly, and then an appropriate amount of water is added to prepare a turbid liquid; then a chelating agent is added into the turbid liquid so as to obtain a clear solution; finally the clear solution is subjected to drying, pre-burning and calcination treatment, and the lithium ion battery material lithium vanadate is obtained. The preparation method has the advantages of simple technology, good electrochemical performance, short preparation time, high selectivity, stable batch electrochemical performance stability, and the like.