PROBLEM TO BE SOLVED: To provide a solid-liquid separation treatment structures for livestock excreta or the like by which the time required for composting a solid portion prepared by separating the solid portion such as feces and the bed of straw from moisture such as urine is shortened, environment for prompting composting is formed and penetration of contaminated water into the ground is prevented to prevent occurrence of environmental pollution and foreign odor.SOLUTION: A floor part 2 constituting a structure body 1 is tilted downward toward the tip to form a steep slope 2c having inclination angle in the first half side larger than that in the second half side from the middle. Right and left side wall parts 3, 3 are erected in both side edges of the floor part 2. A front wall part 4 is erected from the tip of a floor part 2 while being connected to respective side wall parts 3, 3. A plurality of liquid flow-out holes 7 are formed on the front wall part 4 and can be opened or closed by a shutter 8. A liquid storage tank 9 is mounted on a ground outside the structure body 1 while being positioned below the liquid flow-out port 7.
