The invention relates to an automatic sampling device for feed sampling. The automatic sampling device comprises a sampling machine body and a plurality of elastic sampling mechanisms arranged on thesampling machine body, wherein each elastic sampling mechanism comprises a sampling rod and a limiting sleeve arranged outside the sampling rod in a sleeving mode and elastically connected with the sampling rod; and each sampling rod is arranged on the sampling machine body through the corresponding limiting sleeve. Compared with the prior art, the limiting sleeve is arranged outside the corresponding sampling rod in a sleeving mode and is elastically connected with the sampling rod, so that the stable installation of the sampling rod in the corresponding limiting sleeve can be ensured, the elastic connection between the sampling rod and the corresponding limiting sleeve can be ensued, relative displacement in the vertical direction occurs between the sampling rod and the corresponding limiting sleeve, the sampling mode is flexible, the sampling is uniform, the rigid collision between the bottom of the sampling rod and a bottom plate of a material pile or a bottom plate of a stock binis avoided, the device is effectively protected, the service life of the device is prolonged, the smooth proceeding of the feed sampling process is guaranteed, and the quality of the feed is guaranteed.