The invention discloses miniature equipment for grinding monocrystal diamond micro blades. The equipment comprises a workpiece feeding device and a shaft sleeve and shaft transmission feeding device.The workpiece feeding device comprises a clamp and a driving device for driving the clamp to move transversely and longitudinally, and a to-be-machined monocrystal diamond is clamped on the clamp. Theshaft sleeve and shaft transmission feeding device comprises a case, a miniature grinding wheel and a planetary gear transmission system in the case. The invention further discloses a method for grinding the monocrystal diamond micro blades by the miniature equipment for grinding the monocrystal diamond micro blades. According to the method, an easy-to-grind direction of a crystal surface is determined by a laser positioning device, detected information is transmitted to a control system in real time, and the control system controls actions of the workpiece feeding device and the shaft sleeveand shaft transmission feeding device to realize grinding of the micro blades. By the equipment and the method, micro-nano ultra-precision grinding of the micro blades of monocrystal diamond tools can be realized.