The utility model relates to the field of agricultural planting, in particular to a fixed water adding device for an
agaricus bisporus fruiting
bed surface, which comprises a support and fruiting
bed trays, the support is divided into a plurality of
layers through transverse supporting rods along the height direction, each layer of support is provided with a longitudinal supporting rod for supporting the fruiting
bed trays, and the longitudinal supporting rods are connected with the longitudinal supporting rods. The fruiting bed trays are evenly distributed in the support, one end of the support is provided with a slide matched with the fruiting bed surface for use, guide rails are arranged on outer side rods on the top and the middle of the support in the length direction of the outer side rods, sliding blocks are arranged on the guide rails, and movable spraying devices are fixedly connected to the sliding blocks. The device can realize uniform water adding, guarantees the
mushroom yield, and improves the working efficiency.