While numerous near‐infrared (NIR) materials have emerged, most of them are strongly colored or black due to the absorption band or tails in the visible region. Here, a highly transparent and soluble NIR‐absorbing ionic salt, isobutyl‐substituted diimmonium borate (IDI), is synthesized and fabricated, through a solution process, as a thin film that shows a transmittance of over 93% in the whole visible region. A transparent photothermal (PT) film heater is fabricated with the IDI‐doped polymer solution, which shows a photothermal conversion efficiency (ηPT) of 75.2%. Additionally, the prepared PT heater shows a high water evaporation conversion efficiency (ηw) of 68.8% upon exposure to a 1064 nm laser. Furthermore, the transparent IDI film affords the development of a wireless transparent actuator for the first time, generating a bending angle over 75°, with over 2700 bending cycles. The transparent IDI film creates a hot transparent Venus flytrap and a colorful or fluorescent actuator upon the addition of colorants without losing the actuation properties. A highly transparent near‐infrared (NIR)‐absorbing isobutyl‐substituted diimmonium salt (IDI) selectively absorbs light in the NIR range to provide a transparent photothermal film, IDI‐doped polysulfone (IDIS) film. The IDIS film with 16.7 wt% IDI shows high thermal/moisture resistance, photothermal conversion efficiency, and photodistillation conversion efficiency. By combining this layer with poly(dimethylsiloxane), it becomes a transparent soft actuator that can generate a transparent hot Venus flytrap reversibly.