The invention discloses a high-precision optical lens component assembling device and a high-precision optical lens component assembling method and aims to solve the problems that a conventional optical lens is great in processing difficulty, high in risk, possible in rework for multiple times and hard in precision insurance in a centering processing procedure in the assembling process. The invention provides the high-precision optical lens component assembling device and the high-precision optical lens component assembling method. The device comprises an adjusting platform, at least three photoelectric distance sensors and at least three telescopic adjusting rods, wherein a circular through hole/circular groove is formed in the center of the adjusting platform; an annular lifting platformwhich can be lifted vertically is arranged inside the circular through hole/circular groove; a vacuum adsorber is fixedly arranged in the center of the annular lifting platform; lens frames to be assembled are placed and adjusted on the annular lifting platform; the vacuum adsorber is used for adsorbing a lens to be assembled; and both the photoelectric distance sensor and the telescopic adjusting rod are uniformly distributed on the adjusting platform along a circumference and point to the center of the adjusting platform. On the premise that assembling precision is met, the coaxiality of alens optical axis and a mechanical central axis of the lens frame is ensured, centering processing is not needed, and a series of problems caused by centering processing are avoided.