The wind pressure distribution law of the roof trough concentrator group is studied by large eddy simulation， and the numerical simulation results were compared with the wind tunnel experimental results to verify the accuracy of the large eddy simulation results. Then， the wind pressure distribution of a mirror group of nine flat roof concentrators was simulated under 0° elevation angle working conditions， and the most disadvantaged position of the flat roof concentrator group under different wind angles and the distribution law of its wind pressure coefficient were obtained. The results show that in the positive wind direction， the row of mirrors on the roof near the upstream of the incoming wind carries most of the wind load， and the wind pressure coefficient of the middle and rear rows of mirrors is 8.75% of that of the front row； in the oblique wind direction， the maximum wind pressure coefficient of the rear row of mirrors is 17.6% of that of the front row of mirrors； the corner position of the roof is the most disadvantaged position for the group of mirrors. The obtained conclusions can provide a theoretical basis for the design of the wind resistance of the group structure of slotted concentrators on flat roofs.