The invention discloses a multi-prismatic high-speed solid ball bearing retainer. In the retainer, an external radial tangent perpendicular to the center line of each pocket of the retainer is drawn, all intersection points of the external radial tangents are connected to form a multi-prismatic shape and cause the thickness at the tangent intersection point to be thickened, and cause the contact stiffness of the tangent intersection point to be increased, which ensures the overall stiffness thereof; the multi-prismatic structure of the retainer causes the contact between the multi-prismatic structure and a circular bearing ring guide rib to be a two-point contact under the stable contact condition; on the one hand, the two-point contact can obviously enhance supporting stability of the retainer, and improve high-speed running stability of the retainer; on the other hand, the two-point contact reduces contact stress at the contact point of the retainer, and reduces frication and wear of the retainer; meanwhile, a tangential straight edge can seal part of lubricant in a contact state, which is beneficial to improving the lubrication status of the contact point of the multi-prismaticretainer 2; the external radial tangent height h of the multi-prismatic retainer is controlled between 0.1mm and 0.3mm, and the running smoothness of the multi-prismatic retainer is effectively ensured as the h numerical value is very small.