The invention discloses an automation device for wind power spindle flanges before hoisting. The automation device comprises a frame, a conveying device, a limiting baffle, a hole aligning plate, a lifting screw rod, a first motor, a flange stacking and storing frame, a second lifting screw rod and a second motor, wherein the limiting baffle is not higher than the flange; the hole aligning plate is slidably arranged on the hole aligning frame; the lifting screw rod is arranged inside the hole aligning frame and is used for driving the hole aligning plate to slide downwards; the first motor isarranged inside the hole aligning frame and is used for driving the lifting screw rod to rotate; the hole aligning plate is connected with a disc-like rotating plate by virtue of a first thrust bearing; the rotating plate is fixedly connected with at least one pair of sleeves; the top wall of each sleeve is fixedly connected with a spring; each spring is fixedly connected with one hole aligning column which can slide inside the corresponding sleeve; each hole aligning column is rotationally connected with an idler wheel; the diameter of each hole aligning column is smaller than that of the corresponding idler wheel; the diameter of each sleeve is smaller than the hole diameter of each mounting hole in the wind power flange; the flange stacking and storing frame is used for stacking flangeplates; and the second lifting screw rod is used for driving the stacked flange plates to slide up and down. By using the automation device disclosed by the invention, manual operations for aligning the mounting holes before a plurality of flanges are hoisted are reduced, the labor intensity of a worker is alleviated, relatively high efficiency is achieved, and extremely good safety is realized.