The utility model discloses a concrete girder support convenient to dismantle, including concrete placement base, the fixed rotatory top supporting platform of runing rest and concrete placement girder, the top of concrete placement base is provided with bottom sprag and consolidates the crossbearer, the left and right sides that bottom sprag consolidated the crossbearer is provided with the support stand respectively, and bottom sprag consolidates inside position department that the crossbearer top is close to the support stand and be provided with the runing rest and support the reinforcement crossbearer, the runing rest supports the top that consolidates the crossbearer and is provided with runing rest bottom sprag platform. The utility model discloses after the runing rest has been used to the inside of back timber support, the dismantlement and the installation of just having saved the middle part support frame, assign runing rest and support stand as a whole moreover after, what the junction also can be more is firm, dismantles the time limit for a project that the engineering has also been shortened in the use that has just also reduced a large amount of manpowers with installation relaxation relatively, has also reduced dangerous production simultaneously in a certain degree.