The utility model relates to a device for detecting the content of chloride ions in sand for foundation concrete of power transmission line engineering. The device comprises a workbench, a colorimetric card and a transparent color cylinder are arranged on the workbench, a first isolation plate and a second isolation plate are arranged in the transparent color cylinder, and the transparent color cylinder is divided into a first space, a second space and a third space by the first isolation plate and the second isolation plate; a first transparent color cylinder, a second transparent color cylinder and a telescopic rod are arranged in the first space side by side; a supporting plate is arranged at the top of the telescopic rod; a driving motor is arranged on the supporting plate; a stirringshaft is connected below a rotating shaft of the driving motor; a first water outlet pipe is arranged on the outer side wall of the first transparent color cylinder, one end of the first water outletpipe is connected with a first metering switch, the other end of the first water outlet pipe penetrates through the second space and is located in the third space, and a second water outlet pipe and athird water outlet pipe are arranged below the third transparent color cylinder and the fourth transparent color cylinder respectively. According to the utility model, the content value of chloride ions in concrete sand can be obtained.