A method for processing internal gear teeth, comprising the following steps:

(1) Process the rolling external gear, the precision of the rolling external gear is above 5, and the backlash is 5% to 10% of the modulus;

(2) Calculate the profile shape of the tooth surface of the rolled external gear, and obtain the high-order spline modification curve of the tooth top and tooth root of the rolled external gear through digital simulation and experimental correction;

(3) According to the high-order spline modification curve of the tooth top and tooth root of the rolled external gear obtained in step (2), the rolled external gear is subjected to grinding and modification processing;

(4) Machining the internal gear blank, the precision of the internal gear blank is grade 7 to 8;

(5) Normalizing or quenching and tempering heat treatment of the internal gear blank;

(6) Use the rolled external gear obtained in step (3) to perform the steps;

(5) The obtained internal gear blank is rotated forward and reversed.