Embodiments of the present invention disclose a photochromic lens module, a camera, and a terminal device. The photochromic lens module includes a lens module and a photochromic thin film. The lens module includes a first surface and a second surface. When the first surface is an incident surface, the second surface is a refractive surface; when the second surface is an incident surface, the first surface is a refractive surface. The photochromic thin film includes a first area and a second area. The photochromic thin film covers the first surface or the second surface. The first area uses a negative photochromic material, and the second area uses a positive photochromic material. By means of the embodiments of the present invention, a lens module can be effectively protected.