Even posthumously, Hank Aaron continues to set records ... 'cause TMZ Sports has learned one of his rookie cards just sold for over $700K, making it the most expensive Aaron card EVER.
Aaron's famous 1954 Topps piece netted $720K at auction on Thursday night -- easily surpassing the old record of $645K for a Hank card.
Officials at PWCC tell us it sold for the staggering price because the card "is one of the finest on the market" ... and "ranks among the most recognized and respected baseball cards in the industry.