The invention provides a stress sensitive gas reservoir test production differential pressure calculation method. The method comprises the following steps that according to the logging information, the reservoir thickness h, the borehole radius rw and the reservoir temperature T of a test layer are obtained; according to the adjoining well information, the effective liquid supply radius re, the gas viscosity mu and the natural gas average deviation factor Z of the test layer are obtained; the initial permeability K0, the reservoir original pressure pe and the stress sensitive coefficient beta of the test layer are obtained; the model of minimum well bottom pressure pw is established; and S7, the model of the production differential pressure delta p during stress sensitive gas reservoir testing is established. The stress sensitive gas reservoir test production differential pressure calculation model is established based on capacity response, the minimum well bottom pressure of various stress sensitive gas reservoirs, especially a low-porosity and permeability gas reservoir can be accurately obtained, and thus the allowed maximum test production differential pressure can be accurately obtained, the scientific basis is provided for selection of the production differential pressure during operation like gas reservoir production testing, operation time is shortened, operation cost is reduced, and great economic and technical value is achieved.