The invention discloses a cotton flock pulping process which specifically comprises the following steps: S1) taking cotton flock as a raw material, cooking the cotton flock to obtain the cotton pulp, or directly bleaching without alkali soaking or cooking; S2) pouring the pulp into a material tank, diluting with concentrated black liquor, pumping into a pulping device by adopting a pump, defibering the fiber according to the technological requirements, cutting off and preparing into the required pulp; S3) pumping the prepared pulp into an extracting device by adopting the pump, and extracting the concentrated black liquid by adopting an extractor; S4) diluting the pulp without the concentrated black liquid by adopting material washing water, flushing into a pulp tank, and cleaning the pulp till obtaining the end product; and S5) finally treating for 30-50 minutes under the conditions that the chlorine content is 3.5-5.2 and the pH value is 3.2 to 4.4, thereby obtaining the cotton pulp. According to the invention, the strength and use ratio of the cotton pulp can be increased, the consumption and the cost can be reduced, and the pollution can be reduced or eliminated.