The utility model provides a I shaped steel connects bracket for prefabricating assembled concrete center pillar, the shaft of concrete center pillar is provided with four brackets, is first bracket, second bracket, third bracket and fourth bracket respectively. First bracket and the shaft both sides of second bracket symmetrical arrangement at the concrete center pillar, third bracket and fourth bracket symmetrical arrangement are in the other both sides of the shaft of concrete center pillar. Form cross node between these four brackets and the concrete center pillar. Four brackets of concrete center pillar and this become integrative component in the interplant prefabrication. The utility model discloses can reduce on -the -spot concrete placement, reduce the pollution to the environment, carry out welded connection on -the -spot with the crossbeam simultaneously, avoid traditional reinforced concrete to connect for the simple structure, construction quality guarantees more easily.