The invention discloses a verticality tester for a transmission pole. The verticality tester comprises a first component and a second component which are used cooperatively; the first component and the second component sleeve the outer part of the transmission pole at intervals; the first component comprises a first ring sleeve used for being fixed on the transmission pole in a surrounding mode, abubble level bar and a light emitter fixed on the end face of the first ring sleeve; the second component comprises a second sleeve ring used for being fixed on the transmission pole in the surrounding mode, a bubble level bar and a second dial arranged on the end face of the second sleeve ring opposite to the light emitter. According to the verticality tester, the skew direction of the transmission pole can be measured, the transmission pole can be adjusted in time in the pole planting process of the transmission pole, the verticality of the transmission pole is kept, a bearing line is morestable, and the problem of side falling of the transmission pole can be prevented; the accumulated error of a transmission line during erection of the long-distance transmission line is reduced, the side tension on the transmission line is reduced, the application amount of the transmission line is reduced, and the stability of a power grid line is improved.