The invention relates to the technical field of architectural structures, in particular to a connection joint of a core drum wall body and a concrete beam and a construction technology. The connection joint comprises the core drum wall body and the concrete beam. A groove is formed in the core drum wall body. A bulge matched with the groove is arranged on the concrete beam. A pre-embedded part is pre-arranged in the core drum wall body. The pre-embedded part comprises connectors, wall body anchor bars, a filling part and a vertical plate. A through hole is formed in the vertical plate. One end of the filling part is inserted in the through hole and used for taking out the filling part to form the groove after the core drum wall body is poured. The inner side surface of the vertical plate is connected with the connectors. The connectors are connected with the wall body anchor bars. The position where the vertical plate is connected with the connectors is provided with connecting holes. Longitudinal bars are pre-arranged in the concrete beam. The longitudinal bars are connected with the connectors by penetrating through the connecting holes. According to the connection joint of the core drum wall body and the concrete beam and the construction technology, the groove is reserved under the condition that sliding formwork construction or creeping formwork construction of the core drum wall body is met, and the fact that the wall body is connected with the beam in a high quality mode and the shear capacity are ensured.