The code and data for "The ES-GNF method of unstructured tetrahedral mesh for fast inversion of gravity and magnetic data with undulating terrain". This dataset includes unstructured tetrahedral mesh establishment and corresponding kernel matrix calculation program, and has gravity and magnetic anomaly data and inversion results of the model test part in manuscript 'The ES-GNF method of unstructured tetrahedral mesh for fast inversion of gravity and magnetic data with undulating terrain'.