Disclosed are an inter-device communication transmission system and a method. The inter-device communication transmission system includes a first-communication platform disposed in a first electronic device and a second-communication platform disposed in a second electronic device. When the first electronic device installs an application program, the first-communication platform selectively transmits the application program to the second-communication platform, so that the second-communication platform can install the application program. When the second electronic device executes a function of the application program, the second-communication platform transmits a command corresponding to the function to the application program installed in the first electronic device through the first-communication platform, and the command is executed by the application program to retrieve data. The first-communication platform transmits the data to the second-communication platform, and the second-communication platform transfers the data to the application program in the second electronic device for display of the data.