A friction energy dissipation beam falling prevention device belongs to the technical field of quakeproofing and disaster reduction. The device comprises two fixed end assemblies which are connected with a bridge 
pier and a bridge beam respectively, two channel steel systems, a connection steel plate, and four rotation friction energy dissipation hinges. The fixed end assemblies are anchored on the bridge 
pier and the bridge beam by four pre-embedded high-strength bolts, each channel steel 
system comprises two channel steels which are backed up against each other, each rotation friction energy dissipation hinge comprises two annular steel sheets, two annular 
copper sheets and a high-strength bolt. The high-strength bolt sequentially passes through its corresponding annular steel sheet, annular 
copper sheet, channel steel extending steel plate of the fixed end 
assembly or the connection steel plate, channel steel, annular 
copper sheet and annular steel sheet to form the rotation friction energy dissipation hinge. When the bridge beam shifts relative to the bridge 
pier, the four hinge structures can freely rotate and prevent the beam from falling, and simultaneously the annular steel sheets, the annular copper sheets, the channel steels and the fixed end 
steel plates or the connection steel plate can also dissipate 
some energy during the rotation process.