Connecting structure of prefabricated wallboard

The utility model discloses a connecting structure of a prefabricated wallboard. The connecting structure comprises a plurality of upper prefabricated slabs and a plurality of lower prefabricated slabs, the upper precast slabs and the lower precast slabs are arranged at intervals; the two sides of the upper prefabricated plate extend outwards to be provided with first connecting tables correspondingly. The two sides of the lower prefabricated plate extend outwards to be provided with second connecting tables correspondingly. The first connecting table is thinner than the upper prefabricated plate and forms a step surface with the end surface of the upper prefabricated plate; the second connecting table extends to the step surface and is overlapped with the first connecting table in a staggered manner; a threaded through hole is formed in the first connecting table in the direction perpendicular to the first connecting table, a countersunk head threaded hole is correspondingly formed inthe second connecting ta