The invention discloses a drilling gas minimum-flow measurement method, and belongs to the technical field of gas extraction. According to the method, when the single hole flow of measured drilling holes is smaller than the flow measurement lower limit of a gas extraction parameter tester, an air entraining needle tubing is inserted into the part, close to the coal wall side, of an extraction branch pipe of a flow guiding pipe by a certain distance, and the flow at the flow guiding pipe is increased by guiding in part of air in a roadway through the air entraining needle tubing; the air entraining needle tubing size and inserting position and the measurement time are determined reasonably; and the single hole gas extraction flow can be precisely measured through existing gas extraction comprehensive parameter testers. The drilling gas minimum-flow measurement method is easy to operate, high in speed and small in extraction system influence, and can measure the flow of any small drilling holes theoretically.