Consider with the problems of accuracy, homogeneity, stability in high frequency current detection, a high frequency current sensing frontend circuit based on shunt resistor and linear isolation amplifier Si8920 is proposed, afnd study the feasibility of its application in high frequency surgical equipment. Take the detection of high frequency current in the range of 0.1~1.0 A (0.1 A step) as example，the new scheme is compared with the existing high frequency current sensing scheme based on current transformer. The research has proved that the new scheme has good performance in terms of accuracy, linearity, stability of high frequency current detection, and has some advantages in terms of anti distortion and volume occupation. This scheme can be used as a new choice for high frequency current detection in high frequency surgical equipment.