The present invention discloses a deep water protection platform drilling riser pontoon area load test and experiment device. The experiment device comprises a riser model, pontoon models and a three-component force measuring device; the upper part of the riser model is fixed with a plurality of pontoon models; the top of the riser model is connected with a lower end model of a near-water surfacedetachment device; the bottom of the riser model is connected with the three-component force measuring device; the three-component force measuring device is fixed on a bottom fixing device; and the outer wall of the riser model is provided with a plurality of fiber measuring devices. According to the technical scheme of the present invention, by using the riser model, the similarity simulation ofthe riser principle can be implemented, and the gravity similarity theory is satisfied, so that the experimental model has strong similarity with the experimental prototype; by using the three-component force device, the tension at the bottom end of the riser and the drag force of the pipe under the action of the current can be measured; and by using the experiment device provided by the present invention, the hydrodynamic performance of the local area of the deep water protection platform drilling riser pontoon in the self-storage condition and the local stress load characteristics of the riser near the pontoon can be tested and evaluated.