Abstract: An automatic cleaning device for the seed absorbing needles of a vacuum planter includes a rectangular vacuum rack rotatable sliding with a pair of lateral plate and operated by a first pneumatic pump, a seed planting mechanism having a plurality of aligned thru holes for engaging with a plurality of planting pipes under a plurality of tubular needle of the vacuum rack and a sliding plate operated by a second pneumatic pump disposed with the seed planting mechanism. When the first pneumatic pump provides negative air pressure, the tubular needles regularly and repeatedly pick up the seeds from a seed container and drop the seeds down into the planting pipe. When the first pneumatic pump timely provides positive air pressure to clean the needles, the sliding plate operated by a second pneumatic pump will close the planting pipe to prevent the filth or dirt from the air from contaminating the tubular needles.