The invention relates to a forming die for a half-housing body of an axle housing and a machining technology. The forming die for the half-housing body of the axle housing is characterized in that thetops of the upper end faces of the two side walls of a female die body of the die are on the same plane and are the same in height, and the upper end faces and the inner walls of the female die bodyare in smooth transition; the side walls of the female die body are in the same cross-section shape in the length direction; an ejector is located at the bottom of the die; and the upper surface of the ejector and the bottom profile of the female die body of the die jointly form the shape of the outer surface of the bottom of the half-housing body. According to the forming die for the half-housingbody of the axle housing and the machining technology, the quality problems of unevenness, severe strain and severe gnawing of the plate surface in the stamping forming process of the half-housing body of the axle housing are solved, and in addition, the problems that due to an existing technology and an existing die structure, galling and strain of an opening of the female die body of the die are likely to occur, and built-up edges are likely to be formed at the opening of the female die body of the die are solved; and by changing the die structure, the half-housing body forming technological process is adjusted, namely the forming process of the half-housing body is changed from the original process that longitudinal bending is conducted first and then two-side edge turning is conductedto the technological process that forming is conducted gradually with two-side edge turning as the main step and longitudinal bending as the auxiliary step, so that the bending process of the axle housing is completed under the constraint condition of the die, and it is guaranteed that wrinkling, strain and gnawing of the plate surface of the half-housing body are avoided.