The invention discloses a special pulley block for a hot-line vertical rod tool of a hot-line work bucket arm vehicle. The special pulley block comprises an upper hoop piece, a lower hoop piece, a bolt, a hinge, a left support, a right support, a pulley installing rod and three pulleys. The upper hoop piece comprises a first cross rod, a first vertical rod and a first connecting rod. The left end of the first cross rod is fixed to the top end of the first vertical rod, and the first connecting rod is transversely arranged. The lower hoop piece comprises a second cross rod and a second vertical rod, and the right end of the second cross rod is fixed to the bottom end of the second vertical rod. The right end of the first cross rod is hinged to the top end of the second vertical rod through the hinge. The first connecting rod and the left end of the second cross rod are fixed together through the bolt. The left support is arranged on the left side of the lower surface of the second cross rod, and the right support is arranged on the right side of the lower surface of the second cross rod. The pulley installing rod is connected between the left support and the right support in a striding manner. The three pulleys are sequentially connected to the pulley installing rod in a sleeving manner from left to right. The special pulley block is matched with a bucket arm of the 26-meter hot-line work bucket arm vehicle in size, and the pulley block is easy and convenient to install.