The squeezed disk cast-in-place pile has good characteristics of load and economic benefit in architecture. Because of the complicated load changes in the work condition, it is necessary to ensure the whole machine’s security when it works through doing mechanics analysis on the main machine’s key components. The paper has applied the static finite element theory to analyze the squeezing arm by COSMOS, gaining the maximal value of stress and displacement, including the positions of the value. It is shown that the maximum compressional stress of hinge-pin is 328.1MPa and the biggest displacement is upto 0.2883mm. Accordingly, the values are 58.89MPa and 0.1389mm of the upper-arm, and 105.1MPa and 0.174mm of lower-arm. The results have some practical values on optimizing machine design, reducing the cost on experiment and manufacture.