For the ubiquitous problem of heavier weight, difficult assembling, low efficiency of the sensor calibration of the sensor clamp device of traditional weighing sensor error calibration device, a new sensor clamp device is designed in this paper. The finite element analysis of a new type of fixture is carried out by using the finite element analysis technology, the results show that the weight of the new sensor device is reduced by 7.46% compared with the traditional fixture, but also has a higher stiffness and strength. The dynamic characteristics of the sensor fixture is analyzed and studied through the modal analysis, the results show that the third and fifth mode shape have the greatest impact on the cylinder and the cylinder head which connected to the transverse junction. The above research can provide some theoretical reference and engineering reference for the design of other sensor fixture.