The invention relates to an adaptive congestion control method for a communication network and belongs to the technical field of network engineering. The method comprises the following steps: calculating a queue difference e(k) in each sampling period; measuring input flow rate r(k) of a data package; calculating a data flow rate difference x(k); calculating a variance ratio deltar(k) of the dataflow rate; obtaining an average value delta*(k) of the variance ratio of the data flow rate; comparing a transient queue error e(k) with a preset error threshold e[th]; calculating a modified price pr(k) and probability conversion coefficient mu(k) according to a selected control method; calculating a drop probability p(k) by the following formula according to the price pr(k) and the conversion coefficient mu(k), and performing data package drop operation. The method requires simple structure and has strong expandability, and can effectively solve technical problems in REM, reduces route queuing time delay and jitter, ensures high link availability, and has good adaptability in a complicated dynamic environment.