The invention discloses a diaphragm type gas meter revolution volume acquisition method based on a short-time self-correlation algorithm. The method specifically comprises the steps: after a differential pressure signal acquired by a differential pressure sensor at an air inlet and an air outlet of a diaphragm type gas meter is subjected to amplification, A/D conversion processing and windowing preprocessing, a short-time stable voltage signal x(n) is obtained, wherein a short-time self-correlation functionalgorithm Rx(m) formula of the short-time stable voltage signal x(n) is shown in the original PDFdescription; by an external data acquiring and processing module, differential pressure signals are sampled at equal intervals in a period of time, and the acquired signal numerical values are subjected to short-time self-correlation analysis, so that a revolution periodic value of a to-be-tested table can be obtained, and the revolution volume is obtained after calculation. According to the diaphragm type gas meter revolution volume acquisition method based on the short-time self-correlation algorithm, on the basis of keeping the great accuracy, the detection efficiency is largely improved.