The invention discloses an acoustic emission source expansion device integrated water engineering construction behavior fiber sensing apparatus. The apparatus comprises a baseboard, and a first side plate and a second side plate fixedly connected to two sides of the baseboard, the top of the first side plate is connected with the top of the second side plate through an arc-shaped fiber carrying channel, and the baseboard, the first side plate, the second side plate and the arc-shaped fiber carrying channel form a main common cavity hole; and a pair of sensing fibers is arranged in the arc-shaped fiber carrying channel, the sensing fibers are compressed in arc-shaped fiber carrying channel through a pressing block, the pressing block is provided with a plurality of springs, the springs compact the pressing block through a cover plate, and the cover plate is arranged on the first side plate and the second side plate. A sensing fiber acoustic emission sending apparatus laying device fusing the main common cavity hole, common cavity hexagonal pores and common cavity circular pores is provided for the first time, and innovatively uses multiform cavity pores, large and small dimension cavity holes and spatial different position cavity pores to construct a multi-level and multi-different duration acoustic emission source in order to realize influences on the multi levels and the multiple different durations of light information in the sensing fibers.