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The application discloses a kind of inclined arrangement tube bundle support strip expansion device and pipe penetrating method of pressurized water reactor passive residual heat removal heat exchanger, the device includes expansion pin, expansion screw, positioning groove plate, nylon top wire and butterfly nut, wherein, positioning groove plate can be fixed in tube bundle support strip expansion pin, by pre-tightening butterfly nut, the expansion screw inside expansion pin moves along the taper hole section inside expansion pin, so that the front end of expansion section is expanded, and the gap L between two adjacent tube bundle support strips is expanded;When the gap L between two tube bundle support strips is reduced after welding with the toothed plate, the installation sequence of the device can be set according to the pipe penetrating sequence, and the gap L between tube bundle support strips is expanded;In the process of expansion, expansion pin does not rub with the semicircular groove of support strip, and does not scratch tube bundle support strip, to ensure the pipe penetrating effect of heat exchange tube.