The invention relates to a projecting device and a light source module thereof as well as a driving method. The projecting device comprises a lighting device, a light source module and a system processor. The light source module comprises a light source circuit and a light source control system; the light source control system comprises identification data; the system processor is used for readingand judging whether the identification data can satisfy predetermined conditions; when the identification data can satisfy the predetermined conditions, the system processor controls the lighting device and provides a driving electrical signal to ensure that the driving electrical signal can start the light source circuit. The invention judges whether the identification data stored in the light source module can satisfy the predetermined conditions, so as to ensure that the used light source module is provided by an original factory. Moreover, the invention judges whether the operating parameters of the bulb can satisfy error conditions so as to improve the use safety.