The invention discloses a new technique used for manufacturing poly(p-phenytene terephthalamide) resin, which comprises steps that: (1) para-phenylenediamine and 50-95 percent of terephthaloyl chloride are treated with pre-polycondensation in a solution system at low temperature; (2) the left 5-50 percent of the terephthaloyl chloride is made into a solution with 30-70 percent of content in N-methyl pyrrolidone, and the solution is pumped into a pre-polycondensation screw extruder together with prepolymer; (3) the reaction mixture is intruded into a main reaction screw extruder and a macromolecule addictive, polyvinyl pyrrolidone-N-methyl pyrrolidone solution is dripped in; (4) the extruded polymer is washed with ice water and neutralized by the cleaning solution of calcium carbonate andpotassium hydroxide and the solvent is recycled; (5) the washed polymer is dehydrated and dried, then light yellow polymer powder of the poly(p-phenytene terephthalamide) with logarithmic viscosity number of 4-7.5dl/g is obtained. The poly (p-phenytene terephthalamide) resin which is manufactured by adopting the technique of the invention has simple technology, being convenient for uninterrupted production, and the prepared polymer powder has fresh color and luster and stable capacities, and the resin has good spinnability, the spun fiber has good color and luster, high strength and high modulus.