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The structure of jet pump is simple, and it cannot be replaced in some special technological process. But the efficiency of energy transfer of jet pump is low, and jet pump performance can be improved by reasonable structural design. The three-dimensional spatial model of multi-nozzle jet pump was established by GAMBIT software. Under the premise of certain area ratio, flow ratio and outlet pressure, the Computational Fluid Dynamic (CFD) software—FLUENT was used to calculate the inner flow field of multi-nozzle jet pump with uniform distribution and horizontal jet flow and different nozzle numbers. The rule of inner flow field of multi-nozzle jet pump is changed with the number of nozzle. According to the simulated flow field, the result shows that the number of nozzle has much effect on the fluid track and the number of nozzle determines the size of backflow region. The performance of the jet pump is not increased with the increase of nozzle numbers; it is not a monotonous rising trend. The result will provide reference for design and study on multi-nozzle jet pumps in the future.