The invention discloses an auxiliary robot device for engineering pipeline construction. The auxiliary robot device for engineering pipeline construction is characterized in that the device comprises a tank, a moving device, a cutting blade rotating device and a spiral soil conveying device, wherein the tank is composed of a tank base and a tank cover; the moving device is used for driving a tool bit to move forwards so as to cut soil, the cutting blade rotating device is used for driving the tool bit to rotate so as to cut the soil, and the spiral soil conveying device is used for moving the soil along a trough in the axial direction under the action of axial component force of normal thrust of blades. The auxiliary robot device for engineering pipeline construction meets motion given by programs and work loads required by soil cutting by adoption of a serial mechanism, and is simple in structure, small in occupied space and low in construction cost. The auxiliary robot device automatically controls equipment to make motion, thereby well ensuring the construction efficiency and speed and being high in safety performance. Laying is carried out in a non-excavation mode, and compared with a method that landfilling is carried out after excavation, the non-excavation mode is simple in construction process and low in cost.