Objective In order to further improve the high-pass flow and high-load capacity of small high-load axial flow fans in small space an accelerated inlet guide vane IGV structure design scheme was proposed. Methods The 3D design software Pro / E was used to design different accelerated IGVs and their effects on the pressure coefficient full pressure efficiency and runner losses at different flow coefficients of the fan were investigated by numerical simulation methods. Results The use of accelerated IGV increased the flow capacity in the flow channel delayed the separation of the airflow at the trailing edge of the blade and made the downstream flow more uniform. With the increase in the acceleration degree of the inlet airflow the total pressure efficiency at the design point basically showed a monotonous increasing trend. Compared with non-accelerated IGV fan when the IGV acceleration degree was 1. 1 and 1. 2 at the design operating point the fan pressure coefficient was increased by 1. 61% and 1. 24% and the efficiency was increased by 3. 49% and 5. 05% respectively. When the acceleration degree of IGV increased from 1. 0 to 1. 5 the fan efficiency was increased by 6. 69%. Conclusion In small high-load axial flow fans accelerated IGV has better effects on fan pressure coefficient and efficiency than non-accelerated IGV and the greater the acceleration degree of IGV is not the better. When the acceleration degree is 1. 1 and 1. 2 the wind performance is the best which provides relevant design references for small high-load axial flow fans