The invention discloses a wireless communication device testability design method. The method includes performing functional unit division on a wireless communication device, including a voice and panel unit, a processor unit, a baseband signal processing unit, a radio frequency unit, a power amplifier unit, a filter unit and a backboard unit, wherein the voice and panel unit, the baseband signal processing unit, the radio frequency unit, the power amplifier unit and the filter unit are connected with the processor unit through respective control interfaces and data communication interfaces via the backboard unit, and the voice and panel unit provides a device internal unit program upgrade interface and maintenance interface to the outside. Main faults of each unit are automatically diagnosed when the device is powered on, a test command is input through the maintenance interface when a fault occurs, a test signal passes through each unit inside and realizes loopback gradually, and the faults of each unit are diagnosed automatically. The wireless communication device testability design method has the beneficial effects of utilizing hardware resources of the device itself, increasing test software to realize testability design of the device itself, accurately positioning the faults inside the device, and greatly reducing debugging and testing and maintenance guarantee cost of the device.