Photothermal microactuators are extensively utilized in optical microelectromechanical systems and microrobotics. A waveguide-type excitation photothermal U-shaped microactuator, with strong controllability and large displacement, is constructed using the narrow-band wave-absorbing properties of functional dyes, and the temperature and displacement changes in the actuator are simulated in this paper. A narrow-band response photothermal microactuator with a single arm length and radius of 5.8 mm and 200 μm, respectively, is constructed. The experimental findings indicate that the actuator produced using the proposed scheme has the benefits of large displacement response, high energy utilization rate, low production cost, and high integration. Driven using a 100 mW laser, the actuator's free end can attain a displacement of 100-160 μm in the violet (408 nm) or red (638 nm) band, which is much greater than the displacement (20 μm) produced by the beam in the non-corresponding band.