The invention relates to a separated-type bearing box which comprises a box body connected with a shell and a bearing assembly for supporting a shaft; the bearing assembly comprises a four-point contact ball bearing and a bearing supporting a radial force which are arranged side by side; the bearing supporting the radial force is close to one side of the shell; the box body comprises a mounting seat, an oil storage tank and a rear end cover, wherein the mounting seat is fixedly connected with the shell; the oil storage tank is fixedly connected with the mounting seat in a seal mode; the rear end cover is used for sealing the mounting seat and is opposite to a shaft-extension end. According to the invention, the technical problems of high casting difficulty of the conventional integrated-type bearing box and large bending moment borne by the bearing are solved, the casting difficulty is reduced greatly the casting quality of the bearing box is improved, the processing and assembling processes of the bearing box are simplified, and the bearing box is more stably and reliably mounted.