The invention provides a vibration and noise reduction device for a gasoline engine generator. The vibration and noise reduction device comprises a large box, a small box, the gasoline engine generator, an L-shaped exhaust pipe and a high-temperature steam pipe. A gap defined by the large box and the small box is filled with water. A drain valve is arranged on the inner bottom of the large box. A cover plate is arranged at the upper end of the small box. An observation window is mounted in a left hole in the cover plate hermetically. A suction plate is mounted in a right hole in the cover plate hermetically. The gasoline engine generator is mounted on the inner bottom of the small box by virtue of supporting seats. An exhausting tank of the gasoline engine generator is connected with one end of the high-temperature steam pipe. The other end of the high-temperature steam pipe is connected with a horizontal section of the L-shaped exhaust pipe. The horizontal section of the L-shaped exhaust pipe penetrates through the side wall of the small box and is positioned in the gap defined by the small box and the large box. The end part of the vertical section of the L-shaped exhaust pipe is positioned above water. A left retaining plate and a right retaining plate are respectively arranged in the horizontal section and the vertical section of the L-shaped exhaust pipe. The vibration and noise reduction device adopts a water medium as a vibration reduction medium, and when the vibration and noise reduction device is not in use, water can be drained; and the vibration and noise reduction device has the characteristics of being simple to operate and convenient to use.