A nonmetallic sound barrier unit plate connection structure is characterized in that the contact surface of nonmetallic sound barrier unit plates that are connected to each other is provided with a groove, and a vibration reduction plate with a hose is installed between the nonmetallic sound barrier unit plates that are connected to each other. The hose of the vibration reduction plate is arrangedin the groove of the contact surface of the unit plates. The structure has the advantages that 1, the vibration reduction performance is good, and the load transfer mode is more reasonable; 2, the sealing performance is good, sound leakage can be effectively prevented, and the sound insulation effect is good; 3, plane contact facilitates installation, and construction is easy to conduct; 4, theflexible connection mode is adopted, and the mechanical property is thus better than the mechanical property in a connection mode in which a tongue-and-groove is used for directly connecting the unitplates; 5, a single-tube rubber plate is flexible, and the size error of the unit plates in the manufacturing process can be effectively adjusted; 6, the weight of the unit plates are used for makingsingle tubes compressed, and the two unit plates are tightly connected together.