The invention discloses a cleaning device for a LCM backlight source structural part. The cleaning device comprises a cleaning box and a transferring and clamping assembly, wherein the middle of the top end of the cleaning box is fixedly provided with the transferring and clamping assembly, the transferring and clamping assembly can clamp and transfer the structural part. The cleaning device is scientific and reasonable, and the use is safe and convenient; by utilizing the transferring and clamping assembly, and the structural part can be clamped, the clamped structural part is integrally operated such as cleaned, washed, wiped, dried and the like, so that the cleaning efficiency of the structural part is greatly improved, and in addition, the friction force between a threaded sliding block and the cleaning box can be effectively reduced by using a moving roller, so that the cleaning and transferring of the structure are more smooth. The clamping pressure of a first clamping plate to the structural part can be effectively reduced through a first clamping rubber gasket, damage to the structural part caused by too large clamping pressure is avoided, meanwhile, the friction force between the structural part and the first clamping plate is increased, and the structural part is prevented from being damaged due to falling in the cleaning process.