The invention discloses a using-procedure-free low-nitrogen condensation type fuel gas steam boiler. The using-procedure-free low-nitrogen condensation type fuel gas steam boiler comprises a chimney,a boiler prying platform base, an integrated energy economizer and condenser, a low-nitrogen burner, a steam valve, a safety valve, a boiler body (including fins, smoke guide plates, an upper collection box, a lower steam-water separator, a lower collection box, an upper steam-water separator, a water inlet and vertical pipelines), an independent downcomer, a water tank, a water feed pump, a liquid level controller and a boiler control cabinet. According to the using-procedure-free low-nitrogen condensation type fuel gas steam boiler, a wall smooth pipe serves as a heat exchanging water pipe,a water pipe with the surface connected with the thick fins in a welded manner serves as a heat exchanging pipe, and the heat exchanging area is increased by 2 times under the same length of the waterpipe; according to the boiler, the service life is prolonged, and the conversion efficiency is also improved; the steam-water separation effect is good, and high-quality steam is obtained; using is convenient, the using range is also enlarged, the energy loss can also be reduced, and meanwhile the discharge amount of nitric oxide is also reduced.