The invention provides a servo-control earth-rockfill mixture transformation permeameter, comprising an upper end cap, a permeating barrel, a porous disc, a lower end cap, a trolley, a servo water-adding device and a pressure-measuring device; wherein, the upper end cap and the permeating barrel can be sealed and detached; the middle of the upper end cap is provided with a water-injecting pressure pipe which can be used for adding high pressure water after being connected with the servo water-adding device; the two sides of the cylinder permeating barrel are provided with 6 water pressure measuring devices with the same interval consisting of a three-way pipe, a pressure measuring pipe for measuring low water pressure and a water pressure gauge for measuring high water pressure; water can enter into a water catchment empty chamber through the porous disc and flows out from a water outlet; the water outlet can control the water discharging speed by be connected with a water discharge switch. By using the structure, the servo-control earth-rockfill mixture transformation permeameter has the advantages that: the sample is a cylinder with the diameter being 300mm and the height being about 600mm and is earth-rockfill mixture comprising coarse grained rock and earth; water can be added in a sealed servo manner, and the water entering speed and pressure can be servo controlled, thus finishing the permeating tests of both low water head and high water head; the upper part and the lower part of the permeameter can be detached, thus realizing safe, simple and convenient use.