Abstract: In order to verify the accuracy of open-source software OpenFOAM in the numerical simulation of petrochemical pump, the open-source software OpenFOAM5.0 was used as a platform to perform steady-state and unsteady-state numerical simulation on the full flow field of IH-type petrochemical centrifugal pump in the operating flow rate range of 0.3 Q_d-1.4 Q_d (Q_d is the design flow rate). The standard k-ε turbulence model was adopted in the flow control equation. The simpleFoam and pimpleDyMFoam solvers were used for the steady-state and unsteady-state calculation respectively. ParaView, the postprocessing software in OpenFOAM, was used to display the calculated flow velocity, pressure and streamline distribution, analyze the relationship between the vortex and the flow loss in the pump, and predict and calculate the external performance parameters of the pump, such as head, input power and efficiency. The pump performance parameters predicted by the open-source software OpenFOAM and the commercial CFD software were compared with the measured values under the same calculation model, grid and boundary conditions. It is indicated that OpenFOAM has higher accuracy in the performance prediction of petrochemical pumps.