Railway rockfall automatic detection and alarm device and method

The invention relates to the technical field of rockfall protection, and particularly discloses a railway rockfall automatic detection alarm device and method.The railway rockfall automatic detection alarm device comprises a bottom plate box, the upper end of the bottom plate box located between two sets of side plate boxes is connected with a supporting bottom plate through a supporting bottom rod, and a first alarm switch is further arranged in a first mounting groove; the interior of the side plate box is connected with camera equipment through a driving piece. A blocking protection plate is arranged at the upper end of the rear side of the bottom plate box located on one side of the supporting bottom plate. According to the device, falling broken stones can be supported through the arranged supporting bottom plate, a first alarm switch can be triggered only when the number of the broken stones reaches a certain number, then a worker can know the broken stones in time, an arranged driving part is connected