The present invention provides a 
system for automatically detecting the redundant object of the 
spaceflight electronic device and a detecting method. The 
system comprises the following components: a sound sensor 1, a rotating platform 2, a 
crank-rocker mechanism 3, an IO*amp;DA board card 4, a 
transducer 5, a three-phase 
machine 6, a sound 
signal regulating circuit 7, a real-
time data collection card 8 and an upper 
machine processor 9. The sound sensor is adhibited on the external wall of the detected pice. The sound sensor 1 is connected with the sound 
signal regulating circuit 7 through a 
signal wire. The sound signal regulating circuit 7 is connected to the real-
time data collection card 8. The real-
time data collection card 8 is connected with the upper 
machine processor 9. The upper machine process 9 is connected with the control end of the 
transducer 5 through the IO*amp;DA board card 4. The 
transducer 5 is connected to the three-phase machine 6 which drives the rotating platform 2 through the 
crank-
rocket mechanism 3. The invention settles the problems of no high detecting precision, no strong objectivity, no realization for automatic detection or automatic determining, only determination to the existence of the redundant particle, no determination to the material and characteristic of the redundant object and the like in the existing traditional PIND detection method.