Abstract: A foldable hand truck comprises a retractible and extendable push handle set having a first set of round holes and a second set of round holes separately formed at a lower and a higher positions; a platform movably provided below the push handle set; a wheel set being mounted on the lower end of the push handle set and beneath the platform; and a platform retraction mechanism including a housing with its top end movably associated with the push handle set and with its lower end removably fixed to the underside of the platform; a push button for controlling the platform retraction mechanism; and a pair of movable push rods; wherein two outer ends of the pair of movable push rods may insert into either the first set of round holes or the second set of round holes on the push handle set; and two inner ends of the pair of movable push rods may shift within two slant slots formed on the push button so as to pull the two outer ends out of the first or the second set of round holes while the push button being presse