Stationary concrete placing boom: distributing equipment for concrete pouring specially designed and produced for engineering construction of railway beam field, nuclear power and so on; mobile concrete placing boom, of three sections of folding arm in the “Z” shape, can be rotated all around, pitched and folded, its amplitude can be changed, realizing three-dimensional and full range of pouring within the length of cantilever crane, leaving no dead space, also, it can easily realize concrete pouring in all sorts of construction operation, including wall, tube, column and pile.