The invention relates to a system for continuous poly(para-phenylene terephthanlamide) powder drying and grading. The system comprises a first funneling stock bin, a filter, a drier, a second funneling stock bin and a vibrating screen. The lower end of the first funneling stock bin is provided with a spiral feeder. The first funneling stock bin is communicated with the lower end of the drier through the spiral feeder. The lower end of the drier is communicated with the filter through a steam preheater. The inside of the upper end of the drier is provided with an isolated fan. The upper end of the drier is communicated with the upper end of the second funneling stock bin. The upper end of the second funneling stock bin is connected to a drying induced draft fan. In addition, the vibrating screen is communicated with the lower end of the second funneling stock bin. The system achieves integration PPTA powder drying and grading and continuous production, overcomes the problems that traditional drying and grading equipment needs cleaning at regular intervals, drying and grading effects are not ideal, and the powder iron ion content is high, and the like, saves the production cost and the labor cost, and reduces the energy consumption.