A film transfer device with a slidable protection cap includes a case including a compartment, a receiving section connected with the compartment, and an opening section in proximity to the receiving section. A reel mechanism is disposed in the compartment. An application head assembly is retained in the receiving section and includes an application head exposed outside the opening section. A protection cap is slidably mounted in the receiving section between a first position and a second position. The application head is concealed by the protection cap when the protection cap is in the first position. The application head is exposed from the protection cap when the protection cap is in the second position.