The invention discloses a welding point monitoring device for a steel structure of building engineering, which is characterized by comprising a first monitoring vehicle, a second monitoring vehicle, arotating mechanism used for connecting the first monitoring vehicle and the second monitoring vehicle, a first controller is respectively connected with a first electric adjusting component, a firstelectric guide wheel component, a first camera and a first rotating component; a second controller is respectively connected with a second electric adjusting component, a second electric guide wheel component, s second camera and a second rotating component; a remote control is used for sending a control instruction to respectively control the first monitoring vehicle and the second monitoring vehicle to action by the first controller and the second controller. By utilizing the monitoring device, a worker only needs to stand on the ground, and the monitoring work of the welding points of the beam and the longitudinal beam can be achieved by controlling the movement of the first monitoring vehicle and the second monitoring vehicle by using the remote control, the monitoring efficiency is high, and the potential safety hazard caused by climbing the longitudinal beam is avoided.