Section cutting device of hole digger capable of timely cooling

The utility model discloses a section cutting device capable of being cooled in time for a hole digger. A hole digging machine relates to the technical field of hole digging machines, and comprises aprotective barrel, a rotary cutter and a cooling mechanism, the cooling mechanism comprises a water inlet pipe, a cooling water pump and a water spray pipe, the water inlet pipe and the water spray pipe are respectively communicated with the cooling water pump, the cooling water pump is arranged in the protective barrel, and one end of the water spray pipe extends out of the protective barrel andfaces the rotary cutter. When the rotary cutter acts on mountainous and hilly areas and the like, a high-temperature effect is easily generated, and then the service life of the rotary cutter is influenced. Due to the arrangement of the cold area mechanism, cooling liquid is sprayed to the rotary cutter from the water inlet pipe under the action of the cooling water pump so as to cool the rotary cutter, the rotary cutter c