The invention belongs to the technical field of molding sand recycling devices and provides a sand billet recycling device. Nozzles and a feeding conveying belt are arranged in a humidifying box. The humidifying box is provided with a feeding inlet. The nozzles are arranged at the top of the humidifying box and are aligned with the feeding conveying belt. A smashing box is arranged below the humidifying box and provided with a hopper feeding inlet. A main smashing shaft and an auxiliary smashing shaft are arranged in the smashing box. The auxiliary smashing shaft is arranged below the main smashing shaft. The main smashing shaft and the auxiliary smashing shaft are provided with main smashing blades and auxiliary smashing blades correspondingly. A discharging pipe is arranged under the smashing box and connected with a screening box. The screening box is internally provided with a primary screen and a secondary screen. The primary screen is arranged above the secondary screen. The primary screen and the secondary screen are obliquely arranged. A coarse sand storage box is arranged at one end of a primary conveying belt. A fine sand storage box is arranged at one end of a secondary conveying belt. The sand billet recycling device has the beneficial effects that molding sand billets are wetted, the situation that the air is polluted due to the fact that a large amount of dust is produced is avoided, and smashed molding sand is classified and stored through vibration of the primary screen and the secondary screen.