The invention relates to the field of power cable protection, in particular to a power cable passing protection tank which is provided with a protection tank body. The front side and the rear side of the protection tank body are provided with a front slope and a rear slope respectively, and the front slope and the rear slope each forms a certain angle, ranging from 15 degrees to 75 degrees, with the lower side face; the protection tank body is internally provided with a cable containing groove, a movable cover plate is arranged at the upper end of the cable containing groove, and the movable cover plate is connected with the protection tank body through a fixing and connecting unit. The power cable passing protection tank is characterized in that the left side face and the right side face of the protection tank body are provided with installing inserting connection grooves and installing inserting connection heads matched with the installing inserting connection grooves respectively; the protection tank body comprises a right-angle protection tank body and corner protection tank bodies matched with the right-angle protection tank body, wherein the cross section of the right-angle protection tank body is shaped like a parallelogram, and the cross section of each corner protection tank body is shaped like an isosceles trapezoid; the power cable passing protection tank has the advantages of being convenient to install, good in protection effect, convenient to transport, capable of being repeatedly used and the like.