A new method of magnetic metal organic framework（Fe3O4@MOFs） surface assisted laser desorption ionization mass spectrometry（SALDI-MS） was established,based on the ambient synthesization of core-shell magnetic zeolitic imidazolate framework-8（Fe3O4@ZIF-8） microspheres by a simple self assembly method with carboxylated Fe3O4 as the core.The effects of different sample preparation methods such as dried droplet method,thin layer method and sandwich method were investigated in details.Results showed that the sample prepared by sandwich method has many advantages including uniform matrix distribution,little “sweet point”,high sensitivity,and good signal reproducibility.In this paper,triglycerides in peanut oil,lard and canola oil were used as target objects,and different edible oils were identified by the SALDI-MS method rapidly.Compared with traditional MALDI-MS method,the SALDI-MS method based on Fe3O4@ZIF-8 could obtain more abundant composition information of oil,better mass resolution and higher detection sensitivity,could be better applied in the rapid identification of edible oil samples.