The invention provides a multi-dimensional adjusting test platform for hydraulic engineering and application of the multi-dimensional adjusting test platform and belongs to the technical field of scientific research test devices for the hydraulic engineering discipline. The multi-dimensional adjusting test platform comprises a fixed triangular support, a rotary triangular support, a water supply tank, a water stabilizing plate, a trough, a movable baffle, a water surface profile adjusting baffle, an upstream water level probe, a water return opening, a water storage tank, a triangular weir water return opening, a triangular weir water stabilizing plate, a flow water level detection pipe, a triangular weir, a slope adjusting device, a water pump, a water supply pipe, a flow adjusting valve, a water drainage pipe and a water drainage valve. By the adoption of the multi-dimensional adjusting test platform for hydraulic engineering and application of the multi-dimensional adjusting test platform, measurement of the flow coefficient of the weir/sluice water-retaining and sluicing hydraulic structures and determination of the energy dissipation manner can be achieved, and the weir/sluice structure and the arrangement position are optimized; by the adoption of the trough varying slope function, the water surface profiles of riverways with different slope ratios and the linkage manner of the water surface profiles are simulated; the optimal slope ratios of channels are simulated, and the effect the optimal channel fracture surfaces are designed is guaranteed; and by pushing the elastic movable baffle, laying gravel and adopting other means, the water flow states of the local portions of the riverways and the water flow states of riverways with different roughness coefficients are simulated.