The invention discloses a measuring system of the mixed frame size forwarding performance of network equipment and a test method thereof. The measuring system comprises a measuring module, a surface chart drawing module, a storage module, an analysis module, an evaluation module and a display module; based on the definition that the forwarding performance of the network equipment comprises two indexes of throughput and back to back, a mixed frame size scheme is introduced to the test on the forwarding performance of the network equipment; the measuring module realizes measurement on the forwarding performance of the equipment under different frame size distributions through adjusting the proportion of data frames with different frame sizes in a data stream; the surface chart drawing module draws a surface chart according to the measuring result; the analysis module calculates and analyzes the measuring result; the evaluation module calculates the credibility of the measuring result; and the display module displays the analysis on the surface chart and the credibility of the measuring result in an intuitive and visual way. The invention can realize the integration, the automation and the visualization of measurement as well as result analysis and evaluation of the frame size forwarding performance of the network equipment.