The invention relates to a canal excavation construction technology, in particular to a multi-head
excavator with a main excavation head and auxiliary excavation heads, the multi-head
excavator is composed of the main excavation head, the two auxiliary excavation heads and an
excavator base, and the main excavation head and the auxiliary excavation heads are installed in front of the excavator base; each of the main excavation head and the auxiliary excavation heads consists of a spiral gravel drainage device, a semi-conical excavation cutter head and a excavation tooth claw, and is driven to rotate by a driving device installed in the excavator base, a sandy soil layer is
cut while drilling is conducted, and sandy soil is driven by the spiral gravel drainage device to enter the excavator base, so that the tunneling operation is completed; and according to the multi-head excavator, leveling of the bottom of a
ditch and integrated forming of a dam are conducted at the same time, it is possible to achieve a wide-section
ditch stone hole through combination of the multi-head excavator, the
engineering efficiency and quality are improved, and the construction cost is reduced. The multi-head excavator is wide in
engineering adaptability, and can be used for excavating river canals meeting various construction and use requirements.