The present invention relates to a two-stage continuously adjustable concentrating photo-thermal device. The device comprises a first-stage regulation module, a light source module, a concentrating module, a first-class lens barrel, a second-stage regulation module, a second-class lens barrel and a light exit module. One end of the first-stage regulation module is connected with one end of the first-class lens barrel, and the light source module is arranged in the first-stage regulation module and drives the light source module to perform axial motion in the first-stage regulation module. The concentrating module is arranged in the first-class lens barrel, the second-class lens barrel is arranged at the side wall of the first-class lens barrel, the light exit module is arranged in the second-class lens barrel, light ray reflected by the concentrating module enters the second-class lens barrel and exits from the light exit module, and the second-stage regulation module is arranged at the side wall of the second-class lens barrel and drives the light exit module to lift the motion. The two-stage continuously adjustable concentrating photo-thermal device separates the light source module from a heated object to protect the light source well and prolong the life of the light source, the first-stage regulation module and the second-stage regulation module are coordinated with each other to realize continuous regulation, and the light source energy is focused through the concentrating module to improve the light source utilization rate.