The invention discloses a direct lightning strike protecting device of a wind power generator set blade, which comprises a power generator set blade, wherein an aluminum sheet is arranged in the power generator set blade in advance; a multi-discharge tip end is connected to the aluminum sheet, and both ends of the multi-discharge tip end extend out of the edge of the power generator set blade side; both ends of the multi-discharge tip end are in needle tooth shapes; and the aluminum sheet is grounded by a cable. The invention has the characteristics of effectively protecting the wind power generator set blade, preventing earth charge from accumulating on the blade by high-frequency and small-energy tip end discharge and preventing or reducing the direct lightning strike from directly striking the blade.