Aiming at the problem that the energy consumption mechanism of an active flow direct-driving electro-hydrostatic actuator(EHA) based on active check valve and electromagnetic linear actuator is unclear,a mechanical-hydraulic coupling model of the hydraulic system of direct-driving EHA was established,its energy loss was divided into the energy conversion loss composed of hydraulic cylinder and plunger pump and the hydraulic circuit loss,and the energy consumption composition and distribution law of the hydraulic system were quantitatively analyzed. The results show that the load change has a great influence on the energy conversion loss,and the loss ratio is always greater than 27%; the change of frequency can increase the energy consumption of hydraulic circuit in the system,and its loss ratio is always greater than 59%; during the whole working process,the proportion of useful work of the system will increase with the increase of load and decrease with the increase of frequency.