Fraud detection model training method and device, fraud detection method and device and electronic equipment

The invention provides a fraud detection model training method and device, a fraud detection method and device and electronic equipment. The method comprises the following steps: synthesizing false fraud transaction sample data according to real fraud transaction sample data; according to the real fraudulent transaction sample data and the pseudo fraudulent transaction sample data, obtaining a fraudulent transaction sample image; the fraudulent transaction is the fraudulent transaction associated with the sample bank card; obtaining a non-fraudulent transaction sample image according to the real non-fraudulent transaction sample data; using the second sample data set to train a first preset model to obtain a fraud detection model; the second sample data set comprises fraudulent transaction sample images and non-fraudulent transaction sample images. The fraud detection model is used for outputting the probability that the target transaction belongs to the fraud transaction according to a target image obtained