The utility model relates to a heat exchanger structures component technical field provides a top rake arc -shaped guide plate and heat exchanger for heat exchanger shell pass entrance, the arc of this guide plate for seting up a plurality of round holes, just 4 angles of arc are cut removes, the minor face length of guide plate is greater than the bore of pipe that connects of heat exchanger, curved guide plate is same axle center with the barrel. The guide plate is used for welding the distance sink tube to the heat exchanger, the welded mode is the welding of two -sided continuous angle joint, perhaps full penetration welding butt joint welding. The diameter of round hole equals two adjacent intervals of trading between the heat tube outer wall of heat exchanger. The utility model discloses a top rake arc -shaped guide plate has realized the more firm connection of guide plate and bigger tube bank import flow area to increase fluid distribution's homogeneity, reduced the loss of pressure drop, improved the heat transfer effect.