The invention provides a device and method for recycling perforation flow-back sand. The device comprises a hopper, a disc feeding machine, a front spiral conveyor, a heating furnace, a three-cylinder drying oven and a gas-sand separator which are sequentially connected and further comprises a cyclone sand remover, a water adsorption type dust remover, a rear spiral conveyor and a rotary screen. The top outlet of the gas-sand separator is connected with the inlet of the cyclone sand remover. The outlet of the cyclone sand remover is connected with the gas inlet of the water adsorption type dust remover. The bottom outlet of the gas-sand separator is connected with the feed inlet of the rear spiral conveyor. The discharge outlet of the rear spiral conveyor directly faces the feed inlet of the rotary screen. The device and method has the advantages that the conveying, feeding, drying, dust removing and screening of the perforation flow-back sand are achieved sequentially, the screened sand is collected and reutilized, and the environment pollution problem caused by the perforation sand is solved while cost is saved; the whole production process is free of draining of waste liquid and solid waste, and the device and method is recyclable and environmentally friendly.