The invention relates to a spatial fuzzy evaluation method for suitability of a poultry-related habitat in combination with a hydrodynamic model. The spatial fuzzy evaluation method comprises the following steps: selecting key habitat factors of a research area; establishing an evaluation grade set of the key habitat factors; establishing a research area hydrodynamic model; establishing a piecewise semi-normal distribution membership function by adopting a spatial fuzzy evaluation method, determining membership degrees of habitat factors according to a calculation result of the hydrodynamic model, and constructing a single-factor fuzzy evaluation matrix of each habitat factor; determining the relative importance degree of each habitat factor in the poultry-related ecological suitability evaluation system by adopting an analytic hierarchy process; and giving different weight values to different indexes, and finally establishing a dynamic evaluation model of habitat suitability under different space-time conditions according to the hydrodynamic model of the research area in combination with the single-factor fuzzy evaluation matrix and the weight coefficient of each factor. The influence of water depth difference on habitat suitability under different space-time conditions is comprehensively considered, and habitat suitability evaluation is more accurate.