The invention discloses a variable pitch bearing waste oil collection device and an offshore wind turbine adopting the variable pitch bearing waste oil collection device. The variable pitch bearing waste oil collection device comprises a waste oil collection bottle and a connector. The connector is connected with a variable pitch bearing. The variable pitch bearing waste oil collection device is characterized in that the axis of the waste oil collection bottle is collinear with the circle center of the variable pitch bearing, a piston is arranged in the waste oil collection bottle, one end of the waste oil collection bottle is provided with a connection portion, the connection portion is in threaded connection with the connector, the other end of the waste oil collection bottle is provided with a rear cover, the rear cover is detachably connected with the waste oil collection bottle, and the middle of the rear cover is provided with an air exhaust hole. The variable pitch bearing waste oil collection device has the beneficial effects that a 90-degree connector is omitted due to the fact that the axis of the waste oil collection bottle is collinear with the circle center of the variable pitch bearing, waste oil directly flows into the waste oil collection bottle when collected, the waste oil collection efficiency is greatly improved, the variable pitch bearing is prevented from being damaged, and the service life of the variable pitch bearing is prolonged.