Lens fixing device and mounting method

The invention provides lens fixing device and mounting method, the lens fixing device is used for fixing the lens and comprises a lens base and a plurality of flexible balls, wherein, the lens base is matched with the lens, a plurality of stepped holes are provided on the lens base, the flexible balls are mounted in the stepped holes. The invention can effectively eliminate the thermal stress and the mechanical mounting stress generated during working, can implement the flexible assembly of the lens, and the lens fixing device has simple structure, convenient and fast mounting, firm fixing and high assembling accuracy.