The data collector based on aviation test of diminutive unpiloted plane is studied in this paper. The fullduplex serial port UART on microcomputer C8051F121 is used to receive data during aviation test in real time, and the data is stored in FLASH CMOS chip of K9K8G08U0A; the ferroelectric memory of FRAM FM25CL64 is used to store the data list. The data picking up software is designed, and the data stored in K9K8G08U0A can be downloaded to PC for being analyzed and processed according to user's requirement. The cubage of the date collector is 50 mm×35 mm at the cost of only 200 Yuan RMB. With a capacitance of 8 Gbit, the data collector is convenient and reliable for applications, and the data can be stored continuously as long as 30 h and saved about 10 years. The proposed data collector can perfectly realize the data recording in real time and picking up data according to need, and has significant engineering application value.