The invention discloses a building formwork support frame convenient to adjust. The building formwork support frame comprises a device body. The device body comprises a platform device, a rotary device, a fixed device and a cushioning device, the platform device comprises a platform, a column and grooves, the column is connected with the platform, the grooves are formed in the column, the rotary device is connected with the platform device and comprises a rotary shaft, a rotary base and a driving motor, the rotary base is connected with the rotary shaft, the driving motor is connected with the rotary base, the fixed device is connected with the rotary device and comprises a barrel, a flange and a base, the barrel is provided with the flange, the base is connected with the barrel, and the cushioning device is connected with the fixed device and comprises a cushioning pad. The building formwork support frame convenient to adjust has the advantages that the height of a frame of the building formwork support frame can be adjusted, and the building formwork support frame is simple in structure and convenient to operate, can be flexibly arranged and can bring great convenience for using building formworks.