DC current measuring devices provide input signals for control and protection system of HVDC transmission line. With the continuously increase of HVDC voltage class, DC current measurement in high-pressure environment has become a new subject. Firstly, the structure and working principle of high voltage DC current measuring which had been put into operation at home and abroad is reviewed in this paper, and their problems are pointed out. Then,the research progress of high-voltage DC current measurement techniques in China is introduced,which mainly covers zero flux DC current transformer, active DC current transformer, all-fiber DC optical current transformer, DC current transformers based on giant magneto- resistance effect(GMR) and DC current transformer based on fiber bragg grating(FBG), useful reference is given for the design, implementation, operation and maintenance of future high-voltage DC current measuring device.