The invention relates to an agricultural mechanical device, in particular to a variable micro-tiller cutter rest suitable for an urban micro-agricultural scarification operation device. The self-adaptive variable tillage width micro-tiller cutter rest comprises a cutter head and tillage cutters, wherein the cutter head is connected with a power source through a connecting mechanism; sliding grooves are formed in the cutter head; springs and sliding blocks are mounted in the sliding grooves; one end of each the spring is connected and fixed with each the sliding block, the other end is connected and fixed with one end of each the sliding groove, and the sliding blocks slide in the sliding grooves under the action of the springs; and plowing knifes are mounted at the lower end of the slidingblocks. The device has the following advantages: 1. the cutter rest can be applied to multiple vegetable growing pots; 2. a fixing plowing knife is designed in the middle of the cutter head, which can work at the middle leaking plowing place; 3. the cutter rest is simple in structure, high in working efficiency and strong in practicability; 4. the cutter head is designed according to the characteristics of soil movement when the machine is operating, to some extent, the disc structure can act as a soil retaining plate; and 5. the operation efficiency is improved.