Farmland drainage system

The utility model discloses a farmland drainage system. According to the technical scheme, the drainage structure is characterized by comprising a grouted rubble layer, a concrete coping, a soil layerarranged at the bottom of the grouted rubble layer and a drainage pipe arranged between the grouted rubble layer and the soil layer, and a fixing device used for fixing the drainage pipe is arrangedbetween the drainage pipe and the soil layer; the fixing device comprises a fixing round pipe used for fixing the drainage pipe, two supporting plates are fixed to the outer circumferential face of the fixing round pipe, and ground anchors are fixed to the two supporting plates in a penetrating mode. Mounting grooves are formed in the tops of the two ground anchors correspondingly, and strip-shaped through holes are formed in the peripheral sides of the two ground anchors correspondingly. Each ground anchor is internally and telescopically provided with a spine part, and a telescopic mechanismused for driving the spine