Suspension wire pendulum accelerometer is widely used in aviation, aerospace, inertial navigation and other fields, and its assembly quality has a great influence on the accuracy of acceleration measurement. The assembly of its key components involves the adjustment of position and posture, and the suspension wire needs to control the tension force and complete welding during assembly. Aiming at the precision assembly of suspension wire pendulum accelerometer components, a precision assembly and welding system integrating force, temperature sensors and machine vision has been developed. The camera is used with the turntable to realize the visual measurement of the parts to be assembled and complete the identification and positioning of the feature points of the parts; The position and posture of the parts to be assembled are adjusted by the precision sliding table and the turntable; The linear motor motion combined with force feedback realizes the gap adjustment and tension control of the parts during assembly; Develop a special welding unit to realize automatic temperature control welding of micro devices in compact space. The experimental results show that the system can complete the automatic assembly and welding of accelerometer components. The assembly results meet the requirements of technical indicators and the solder joints without virtual welding. The gap deviation between the inner edge of the pendulum assembly and the edge of the magnetic steel is less than 10 μm, the position accuracy of the center of the suspension wire relative to the ground of the accelerometer base is better than 20 μm, and the tension deviation of suspension wire is controlled within ±5 mN. It can meet the product assembly quality requirements.