A novel staring laser warning system based on microcantilever focal plane array is presented. The direction of incident laser can be measured by CCD and microcantilever focal plane array. The microcantilever bends owing to laser radiation captured by infrared lens, meanwhile CCD records the change by means of optical readout system. The experimental results indicate that the field of view is ±15° and the resolution is 0.5°, when the focal length of infrared lens is 60 mm and the microcantilever size is 80 μm×100 μm. The warning system, with large filed of view and high resolution, avoids the interference and damage of CCD caused by laser radiation.