In order to study the flexural performance of ultra-high performance concrete (UHPC) lowly ribbed deck panel and verify its feasibility in multi and long-span continuous beams, two different schemes of UHPC lowly ribbed deck panel were proposed based on the Bin Zhou Yellow River Bridge (average thickness: 16.4 cm and 14.3 cm). Firstly, the practical finite element model was established to obtain the stress of UHPC and the shearing force of headed studs. Secondly, two large-scale bending tests were carried out to obtain the crack initiation and development characteristics, the load-displacement curve, and the strain distribution law. The test shows that the bottom steel plate can resist the development of the crack. The crack width increases linearly with the load. The cracking stress of the two schemes is 16.8 MPa and 15.6 MPa, respectively, with a safety factor of 2.2 and 1.5. When the steel plate yielded, the main crack appeared rapidly, and specimens failed because the tensile crack developed rapidly and the compressive crack appeared. Then, after considering the contribution of UHPC tensile strength, the ultimate bending capacity was calculated by combing the UHPC specifications. The calculation result shows that when the factual material properties are considered, the ultimate capacity can be predicted well through the section nonlinear method. The ratios between the predicted result and experimental result are 0.95 and 1.01 respectively. Finally, the critical design parameters were analyzed. The result indicates that the influence of UHPC tensile strength is small. Increasing the thickness of the steel plate can be an effective way to improve the ultimate bending capacity. The narrow and high rib has higher force efficiency.