Unmanned aerial vehicles (UAVs) have the advantages of flexible take-off/landing sites, easy storage, and low manufacturing cost. They have been applied in many fields such as mapping, disaster assessment, and traffic monitoring. However, it is difficult to balance positioning accuracy, endurance, imaging chip selection, and cost when developing micro-UAVs. Therefore, low-cost UAVs need higher efficiency and imaging precision. This paper presents the design and implementation of a low-cost fixed-wing UAV, covering both the hardware and the software. The system uses BeiDou/GPS integrated positioning to increase the numbers of visible satellites of Global Navigation Satellite System used in positioning and navigating and to reduce the positioning error caused by altitude angle changes; two motion cameras are used for simultaneous shooting as the imaging load. The system is inexpensive. According to the estimation of the test voyage time and the remaining battery power after two flight tests in Shanghai City, the UAV platform operation flight time was about 90 min and the operation voyage was about 70 km.