The invention discloses a method for preparing a green luminescent material of yttrium zirconate doped with terbium. The method comprises the following steps: dissolving yttrium nitrate and terbium nitrate in deionized water according to the mole ratio and stirring; adding zirconium oxychloride with equal molar weight with the total rare earth cation into the solution and fully stirring; adding asodium hydroxide solution drops by drops to obtain a white precipitate and controlling the pH value of the solution at 7-9; putting the solution into a high-pressure kettle, taking the filling degreeat 80% and processing for 6-40 hours at 180-220 DEG C; and finally, centrifugalizing and drying the processed solution to obtain the green luminescent material of yttrium zirconate doped with terbium. The invention adopts a hydrothermal method to realize the synthesis of the green luminescent material of yttrium zirconate doped with terbium and has better crystallization performance of a product,simple technological process and mild condition.