To address the assembly problem between heavy load and high detection resolution during the clamping and assembly of inertial confinement laser nuclear fusion (ICF) target parts, a micro-assembly method based on biaxial rotating structure is proposed in this paper. Firstly, by analyzing the characteristics of the assembly target devices(aluminum sleeve, gold cavity and half cavity), the overall structure scheme of precision assembly is formulated. Then, the dual-axis rotation device is introduced and the corresponding sensor is calibrated, and the angle deflection test of the dual-axis rotating device with integrated sensor is further carried out, which can detect a minimum deflection of 0.01°. The experiments show that the dual-axis rotation device can sensitively detect small deflections, and the sensor has the ability to “zero” for dual-axis rotation, through which the target assembly can be completed without visual guidance.