The invention relates to a pull-out test loading device which comprises cushion blocks, sensors, pullers, displacement meters, a support and small steel pipes. The front ends of the small steel pipesare inserted into steel pipe concrete. The cushion blocks penetrate the small steel pipes and make contact with the steel pipe concrete. The cushion blocks are fixed to the outer edge of the steel pipe concrete. The sensor is fixed to the rear side of each cushion block through the corresponding small steel pipe. The puller is fixed to the rear side of each sensor. The displacement meter is fixedly arranged on each puller. The support is arranged at the tail ends of the small steel pipes. According to the pull-out test loading device, testing of parameters of steel pipe pulling resistant force, anchoring force, the reasonable anchoring length and the optimal interval between the adjacent small steel pipes can be completed smoothly, feasibility, universality and accuracy are improved, and the test cost is saved.