The present invention discloses a four-split spacer for an extra-high voltage transmission line. The spacer comprises a center bracket, four supporting branches and four chuck mechanisms; the four supporting branches are mounted on the peripheral edges of the center support; the four supporting branches are distributed to form a cross-shaped structure; and the four chuck mechanisms are mounted on the tail ends of the four supporting branches, so that the four chuck mechanisms and the tail ends of the four supporting branches form four cable clamping heads. When the four-split spacer is installed or removed, it only needs to rotate an adjustment bolt to drive connection rod mechanisms, so that the clamping or releasing of the chuck mechanisms can be realized, and therefore, the four-split spacer is convenient to use, and the efficiency of the installation construction of the spacer can be effectively improved.