The utility model relates to an agricultural machinery used for growing sand melon, in particular to a farmland gritter for growing sand melon, which comprises a driving device. The utility model is characterized in that a sand case is arranged on the driving device and is provided with a transmission mechanism at the bottom, the end of the transmission mechanism is connected with a sand separation case which is provided with a scraper at the bottom and a dual-way sand separation beater wheel inside. The utility model has the advantages of ability to increase the productivity, reducing the labour and material resource devotion, time saving, and original structure.