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To predict the thrust force accurately in the design of linear micromotor, the Coulomb virtual work (CVW) method was applied to calculate the electromagnetic thrust force based on the finite-element solution of the electromagnetic field. Since only the magnetic field intensity H in the air layer surrounding the moving part is used to calculate the thrust force in the CVW method, the local errors of H in the sheath air layer severely affect the calculation accuracy. To reduce the considerable local errors of H in finite-element field solution, an estimation method of H error with an adaptive mesh algorithm was proposed. The proposed method can adaptively refine the mesh according to the evaluation of H error and thus increase the accuracy of force calculation effectively while require less computation time.