The invention relates to an anti-blockage underground deep layer irrigation device with a flushing function, and belongs to the technical field of agricultural water-saving irrigation. The anti-blockage underground deep layer irrigation device comprises a water irrigation device and a soil entering device, wherein the water irrigation device and the soil entering device are connected with a soil entering sleeve pin hole formed in a soil entering sleeve and a water irrigation post body pin hole formed in a water irrigation post body through positioning pins. The anti-blockage underground deep layer irrigation device has the advantages that the utilization efficiency of irrigation water is improved, the problem that the existing pluggable water irrigation device cannot be inserted into the deep layer underground soil is solved, the device blockage possibility is reduced, the operation is simple, the manual operation quantity is smaller, the anti-blockage underground deep layer irrigation device is suitable for popularization and application in a wide range, the installation of the whole device is convenient, the dismounting is also very convenient, the device maintenance is simpler, and the maintenance cost is lower.