The invention relates to a steel structural component computer simulation installment method, comprising: processing three-dimension measurement on a produced component, using the measurement data to establish a component model in computer; processing simulation installment on the component model in computer; processing installment interference check in computer; analyzing installment accuracy incomputer; and obtaining the information required in the manufacture of component connectors in computer. The simulation installment of component comprises two ways, wherein one way comprises: according to the preassembly drawing requirement of the component, preassembling the established component model in a computer according to the theory positions of the drawing requirement; checking the connection relationship among the components with the product technique requirements, and feeding back the check result and the information demanded in following processes; and the second way comprises: confirming that under the support condition as the components will not deform over technical allowance under gravity, using the connection between components as rule, processing simulation preassembly on the established component model in computer, comparing the error between the assembly positions and the theory positions of the components with allowance range, and feeding back check result as preassembly adjustment and the adjustment information of following processes.