The invention relates to a horizontal disc-type inter-seedling soil loosening and weeding device capable of completing soil loosening, weeding and other operations at a time. The horizontal disc-typeinter-seedling soil loosening and weeding device mainly comprises a seedling raising device, a profiling mechanism, a front cross beam, an hook connection device, a transmission chain, an intermediatetransmission shaft, a main beam, a tensioning device, a soil loosening and weeding component, a profiling four-bar linkage, a bevel gear box, a multi-functional monolithic rack and an inter-row weeding component. During the work of the horizontal disc-type inter-seedling soil loosening and weeding device, as the unit advances, the profiling mechanism, through a pair of sprockets and the transmission chain, accelerates and drives a soil loosening weeding disc to horizontally rotate, and drives the soil loosening and weeding component to perform both a linear motion and a horizontal rotation around the disc so as to crush and comb the soil on the ridge surface, and at the same time, the weeds between the seedlings are removed by hoe teeth and thrown onto the surface of the ridge side to bedried up or buried by subsequent operation of the inter-row weeding component. The horizontal disc-type inter-seedling soil loosening and weeding device has the advantages of high production efficiency, low labor intensity of workers, compact structure, convenient movement and the like.