Radiofrequency heating is widely used in the field of medical aesthetics, which essentially achieves the contraction of collagen in the dermis tissue by increasing its temperature. The paper aimed to study the selective and controllable heating mechanism of pig skin under radiofrequency heating by the finite element method and relevant experiments. A heating model of pig skin was constructed at 4 MHz radiofrequency with a mixed heating mode of fixed-point and reciprocating sliding. Based on the mixed radiofrequency heating, the dermis layer in pig skin was heated rapidly and uniformly due to its relatively high electrical conductivity and thermal conductivity compared to other skin tissue layers. This allowed the dermis temperature \(\stackrel{\text{-}}{\text{Σ}}\text{=55.1±0.1°C}\) to remain at a dynamic plateau period. Under the same conditions, the fresh hairless skin of young pig was heated to verify the model, and the experimental and theoretical results are consistent. The research results have a certain guiding significance in forecasting the changes in human skin temperature field under radiofrequency heating and provide novel insights for future research in related fields.