A plastic bucket mouth thread repair device, including thread repair disc, clamping plate, sliding block and presser plate. Thread repair disc is sleeved on plastic bucket mouth and is driven to rotate, clamping plate is arranged on plastic bucket bottom wall, sliding block is slidably arranged on clamping plate, and presser plate is adjustably arranged on sliding block. The utility model discloses a presser plate clamps the protrusion of plastic bucket bottom, utilizes the characteristics that the structure strength is higher here, and the protrusion of plastic bucket bottom is obliquely clamped, can exert greater holding force, makes the friction greater, makes the clamping of plastic bucket more stable, can avoid damaging plastic bucket, and finally rotates and cuts off burr.
