Noise reduction box-type mobile trailer generator set is widely used in construction sites, highways, railway construction and temporary locations, and it is equipped with air intake and exhaust systems, control systems, maintenance doors, shutters and other facilities. Sound-absorbing materials, reasonable environmental protection design can achieve the effect of noise reduction and shock resistance, the structure is very stable, has the flexibility to facilitate lifting and transfer, and its use in any environment does not affect people's lives and work. The size of the trailer chassis and noise reduction box is determined according to the size of the generator set. The operator can walk around the mobile trailer for easy operation and maintenance. It has high mobility, low center of gravity, compact structure, and safety and reliability.