Noise detection device for gear reducer

The invention relates to the field of gear box detection, in particular to a gear reduction box noise detection device which comprises a sound insulation chamber for placing a to-be-detected gear reduction box, a decibel meter arranged in the sound insulation chamber and used for detecting noise, and a driving part arranged in the sound insulation chamber and used for driving the gear reduction box to operate. A controller electrically connected to the decibel meter is arranged outside the sound insulation chamber, the controller generates a noise-time curve according to signals input by the decibel meter in real time, and the controller is electrically connected with a display screen for displaying the noise-time curve and an audible and visual alarm for giving an alarm when the noise value exceeds the maximum noise value preset in the controller. Therefore, within a long detection time, the display screen can display noise values at all time points within the detection time, so that an operator can check an