The invention discloses a novel thermal insulation solid waste fiber crushing device, which comprises a main shell, a supporting leg, a rotating shaft, a first transmission wheel, a transmission belt, a second transmission wheel, a motor, a motor shaft, a rotating cylinder, a rotating inner cavity, First crushing knife, second crushing knife, fixed shaft, first gear, second gear, sieve plate, sieve plate hole, vibrator, discharge shell, support column, water reservoir, submersible pump, outlet pipe , water mist nozzle, thermal insulation solid waste fiber import and thermal insulation solid waste fiber export. This kind of thermal insulation solid waste fiber crushing device turns to the opposite crushing knife through the set work, which improves the crushing efficiency of the crushing device and saves working time. The discharge shell is fixed on the side wall of the discharge shell The connected water mist nozzle effectively combines the sifted out floating thermal insulation solid waste fibers with water, thereby reducing the floating thermal insulation solid waste fibers, avoiding a large amount of thermal insulation solid waste fibers floating into the air during the discharge process, and protecting the environment and people of good health.