Grid structure with flow hybrid coordination function in nuclear fuel assembly

A grid structure with a flow mixing coordination function in a nuclear fuel assembly comprises grids formed by vertically interlacing multiple stripes (3), a pair of mixing wings (5) being respectively provided at two sides of the top of each intersection of the stripes (3), and each stripe (3) concaving inwardly to form a convex structure (2) with a U-shaped cross-section on the stripe. Coordination between a clamping system and a mixing system is realized by using the convex structure, and the mixing performance of the grid structure is enhanced, thereby improving the critical heat flux of the fuel assembly. The paired convex structures in the form of an access ramp effectively rectify the flow inside the grid structure, thereby reducing the pressure loss.