The invention belongs to a power device system in the technical field of aviation, and relates to a method for correcting the installation thrust of an engine model. The method comprises the following steps: (1.1) acquiring an engine bench thrust Fi data table; (1.2) constructing an engine bench thrust model Ft by adopting a three-dimensional interpolation algorithm; (1.3) carrying out an air inlet blowing test; (1.4) modeling by using an interpolation method; (1.5) establishing an air inlet loss correction model K1; (1.6) building a power extraction loss coefficient database; (1.7) establishing a power extraction loss correction model K2; (1.8) building a spray pipe afterbody resistance loss coefficient database; (1.9) establishing a spray pipe afterbody resistance loss correction model K3; (1.10) finishing modelling of an engine installation thrust model. The method has the advantages of high calculation accuracy, simulation instantaneity, easiness in implementation, short modeling period and high engineering applicability.