Translation:He has two passports.
I am American. I have heard of passport cards: Americans can obtain them and use them for non-air travel between the US and our nearby neighbors (Canada, Mexico, islands in the Caribbean). I believe they are designed for frequent travel between these places, as the passport card does not need to be stamped upon entry and exit (so frequent travel does not fill up your passport). However, I have never heard anyone say "passport book" before. I can only imagine doing so to clear up some confusion between a passport card and a regular passport.
Thanks! That's really interesting.
Like many other Russians I actually have two passports - one for using inside the country and one for the international travels (the latter is optional) But both of them are books.
I am still curious about the existence of the passport card in China though :)