In this paper, a kind of household noodle machine with longitudinal extrusion and spiral structure was designed. Meanwhile, using ANSYS software, the stirring and extrusion part of noodle machine was simulated. The pressure cloud map of the dough fluid domain, the strain cloud map and the stress cloud map of the squeezing axis were obtained by the coupling simulation of the dough fluid and the squeezing axis. When the pressure was between 894.40 and 994.20 kPa, the pressure at the outside was stable. The value of the maximum shape variable of the extrusion shaft was 0.62 mm, and the maximum bending stress was 289.64 MPa, which was satisfied with the requirements of structural design. In order to determine the factors affecting the maximum pressure, several groups of simulation experiments were added. The influences of dough density, power law index, zero shear viscosity and extrusion shaft speed on the maximum extrusion pressure were discussed, furthermore, the main factors were determined. index and zero shear viscosity, which provided a reference for the structural design of noodle machine.