The invention discloses a wall-surface-replaceable temperature-controllable wall-impingement liquid film measuring device, which comprises a wall-impingement plate, a wall-impingement substrate, a wall-impingement test
system platform and a
temperature control module, and is characterized in that the wall-impingement substrate is arranged on the wall-impingement test
system platform, the wall-impingement substrate is provided with a groove, the shape and size of the groove are matched with those of the wall-impingement plate, and the groove is used for accommodating the wall-impingement plate; the
temperature control module comprises a thin film
thermocouple, an acquisition card and a water bath, the thin film
thermocouple is arranged on the wall-impingement substrate, the acquisition card is connected with the thin film
thermocouple and used for measuring the temperature of the wall-impingement substrate, and the water bath is connected with the wall-impingement test
system platform and controls the temperature of the wall-impingement substrate through a
heat transfer medium. The test wall surface can be efficiently replaced under the condition that
laser and a camera are not influenced. According to the application, the circumferentially arranged thermocouples are matched with the high-precision high-frequency acquisition card to monitor and control the wall surface temperature in real time, and the wall collision phenomenon of the wet wall surface can be analyzed.