A releasable tie includes a locking head and a strap body. The locking head includes a base plate, a pair of first side walls, a second side wall, and an operating rod. The operating rod is disposed above a window of the base plate, has a first top surface, and is bilaterally connected to the first side walls via connecting members. At least one first engaging tooth is provided at a predetermined depth extending vertically downward from the first top surface. The first engaging tooth has a second top surface which defines a first tooth depth. The operating rod includes an arm extending toward the strap body. The strap body has a bottom surface formed with plural second engaging teeth engageable with the first engaging tooth. The second engaging teeth have a predetermined tooth pitch smaller than the predetermined depth and a second tooth depth smaller than the first tooth depth.