Wind turbine generator blade hub lightning protection device

The utility model relates to the field of wind turbines, and discloses a wind turbine generator blade hub lightning protection device which comprises a variable-pitch bearing, an outer ring of the variable-pitch bearing is connected with a hub, an inner ring of the variable-pitch bearing is connected with a blade, one end, close to the variable-pitch bearing, of the blade is sleeved with a lightning guide sleeve, and the lightning guide sleeve is provided with a plurality of lightning guide synapses in the direction away from the variable-pitch bearing. An insulating layer is laid on the inner side of the lightning guide sleeve, a plurality of lightning guide bridges are connected to the outer side of the lightning guide sleeve, and the ends, away from the blades, of the lightning guide bridges make contact with the hub. The variable pitch system can be effectively prevented from being damaged by lightning stroke, and the variable pitch system can adapt to angle and position changes between blades and a hub.