The invention discloses an isolating device suitable for three-dimensional tool treatment. The isolating device comprises a cylindrical cylinder which is opened at the upper and lower parts; a door opening is formed in the side of the cylinder and is hinged with a door plate; the lower opened end of the cylinder is fixedly connected with a hoop, the upper opened end of the cylinder is provided with a rubber ring, both the hoop and the rubber ring are coaxial with the cylinder, the outer side of the rubber ring is connected with the inner side wall of the cylinder by N uniformly-distributed springs, the axes of the N springs are coplanar, and the axis of each spring is vertical to the axis of the cylinder, wherein N is an integer which is larger than or equal to 3; the inner side of the rubber ring is provided with a plurality of rollers which is connected with the rubber ring and is capable of rolling along a plane direction vertical to the axis of the cylinder; and each of the cylinder and the door plate is made of a transparent material. The isolating device is used for solving the problem of incapability of isolating the whole three-dimensional molding process by using one piece of equipment in the prior art and achieving the aim of conveniently isolating the three-dimensional molding process.