The invention discloses a train wheel and rail turnout device capable of reducing wheel-rail impact influence and relates to integral-cast frog and a guardrail. The frog comprises wing rails, a point rail and frog bottom plates formed between the wing rails and between the wing rails and the point rail. The guardrail is provided with a guardrail bottom plate and is integrally connected with an outer steel rail. The frog bottom plates and the guardrail bottom plate are thinnest at the corresponding positions of a frog toe end and a frog heel end, the thickness of the frog bottom plates and the guardrail bottom plate gradually increases towards the middle, the even thickness h of the frog bottom plates and the guardrail bottom plate is kept in a range not smaller than a harmful space, and h is the difference between the height of the frog or the steel rail and the height of a wheel flange plus 1-2mm. The train wheel and rail turnout device has the advantages that fierce impact of wheels on the frog due to the existence of the harmful space is avoided effectively, steel wheel and frog damage is reduced, steel wheel and frog maintenance is reduced, and the service life of the steel wheels and the frog are prolonged; the fierce impact of the steel wheels on the frog is eliminated, wheel vibration and noise are reduced, riding comfortableness is increased, and train operation energy consumption is reduced.