The invention provides an underground comprehensive pipe rack mounting robot. The underground comprehensive pipe rack mounting robot comprises a chassis provided with multiple rollers at the bottom, a power device, a lifting device, a tray and a control device; the power device is arranged in the chassis, and is connected with at least one of the multiple rollers; the power device can drive the rollers to rotate, and can drive the chassis to move; the tray is arranged above the chassis through the lifting device; the lower end of the lifting device is connected with the chassis; the upper end of the lifting device is connected with the tray; the lifting device can drive the tray to ascend and descend; and the power device and the lifting device are electrically connected with the control device. The underground comprehensive pipe rack mounting robot can quickly and accurately convey pipelines to corresponding positions where the pipelines need to be mounted to quickly realize conveying of the pipelines, meanwhile, can assist the manual operation to quickly finish mounting of the pipelines, can match with the manual operation to finish heavy physical work, and reduces the labor cost and the time cost.