The invention discloses an actual measurement modeling method for a photovoltaic plant electromechanical transient model, comprising: on the basis of a photovoltaic plant physical device and topology online device of the same, performing simplification and abstract extraction of a calculation model; and by dynamic testing, acquiring various model parameters in the calculation model, and constructing a final model. Compared to the prior art, an illustrative embodiment of the invention comprises the following advantages: the model solves the problem that the photovoltaic plant lacks of a calculation model parameter that accords with the reality, can effectively improve the accuracy of the electromechanical transient program in computing photovoltaic plant property, provides a strong support for the safe and stable operation of a power grid.