A portable dualchannel vibration test system was developed for the vibration testing of the machine arm, numerical control machine tool and other machining equipments. The vibration speed signal of the device was picked up by the ST3 electromagnetic sensor, and the output of the mV voltage of the sensor was amplified by using the amplifier of AD620. The amplified signal was transmitted to PC by using USB6008 data acquisition card of NI company, and the digital lowpass filter, spectrum analysis and correlation analysis software were written based on LabVIEW platform. The actual test results show that the system can achieve a higher sampling frequency sampling, and the mechanical vibration signal analysis and processing is more efficient. The system has the advantages of small size, simple operation, friendly humancomputer interaction.