The invention discloses a mount peel strength test fixture, a testing system and a testing method thereof. The mount peel strength test fixture comprises a mounting seat, a first clamping body and a second clamping body, wherein the mounting seat comprises a bearing main body, a connecting post, and a first rolling body and a second rolling body arranged on the bearing main body at an interval; the first clamping body comprises a first connecting piece and a first mount piece which respectively corresponds to two ends of the first connecting piece one by one; the second clamping body comprises a second connecting piece and a second mount piece which respectively corresponds to two ends of the second connecting piece one by one; an anticorrosive coating sample band is arranged on a to-be-tested steel pipe sample and is fixedly clamped with a tensile chuck of test equipment; a tensile joint can move at a constant speed along a direction away from the tensile chuck. Therefore, the tensile direction and the peeling speed can be controlled, the tension is always perpendicular to the steel pipe surface in the anticorrosive layer peeling process, the peeling speed is uniform, the accuracy of the test results is improved, the test requirement is met, and the operation is simple and labor-saving.