The invention provides an indoor partition device. The indoor partition device comprises an upper rail, a lower rail, two clapboards, a connecting part and two hooks, the upper rail comprises an upperfixing part opened at the lower end, and the upper fixing part is sleeved with an upper slide rail; the lower rail comprises a lower fixing part, the lower fixing part and the upper fixing part are vertically symmetric, and the lower fixing part is sleeved with a lower slide rail; a convex head is arranged at one end of each clapboard, pulleys are arranged at the left end and the right end of each convex head, the two clapboards are vertically symmetric, one clapboard is slidably arranged on the upper slide rail through the pulley, and the other clapboard is slidably arranged on the lower slide rail through the pulley; the connecting part is arranged between the two clapboards; the two hooks are symmetrically clamped on the connecting part. By means of the indoor partition device, since the hooks are added on the clapboards, objects can be hung through spaces at the two sides of the clapboards, and the spaces are made full use of.