The invention relates to a connection device of a pile slab structure deck slab and roadbed, and relates to the novel technical field of expressway construction. The device comprises a plain concrete under layer, a cushion block, a sill plate, original roadbed, a drainage net, a polyurethane pouring crack, a present watering block, a polyester fibre cloth and a bituminous concrete mat formation; the cushion block is arranged on the outer side of the upper portion of the plain concrete under layer, the sill plate is fixedly arranged on the upper side of the cushion block, and the original roadbed is arranged on the inner side of the plain concrete under layer; a back watering overlapping joint band is arranged between the sill plate and the original roadbed, the drainage net is arranged on the outer side face of the original roadbed, and the polyurethane pouring crack is formed in the outer side of the drainage net; the present watering block is poured among the cushion block, the sill plate and the polyurethane pouring crack, the polyester fibre cloth is arranged on the upper side of the sill plate, the present watering block and the original roadbed, and the bituminous concrete mat formation is laid on the upper side of the polyester fibre cloth. The connection device of the pile slab structure deck slab and the roadbed is better in integrality and simple in construction, saves the land, has little influence on the surrounding environment, and is high in assemblage construction degree, short in construction period and good in economy.