Green phosphate and manufacturing method of the same

The present invention is a method for preparing a green phosphor, comprising the steps of: weighing a raw material powder; dry-mixing the weighed raw material in a grinder or a mixer; firing the dry-mixed mixture at 1,000 to 2,000°C in a nitrogen atmosphere of 1 to 10 bar; and collecting and crushing the fired product, and performing a predetermined post-heat treatment and pickling.