The utility model discloses a back row seat framework of a passenger car. The back row seat framework of the passenger car meets the demands of the law of the GB15083-2006 luggage displacement passenger protection device test method, guarantees that back row seats have sufficient shock resistance capacity, and achieves lightweight design. The back row seat framework of the passenger car is composed of a first seat framework body and a second seat framework body. The first seat framework body is composed of a first rectangular frame and a first framework backboard assembly, the first framework backboard assembly is located in the first rectangular frame, and the first rectangular frame and the first framework backboard assembly are connected as a whole. The first seat framework body and the second seat framework body are identical in length, and the width of the first seat framework body is smaller than that of the second seat framework body. The first seat framework body and the second seat framework body are mounted on and fixedly connected to a first floor hinge (47), a middle floor hinge (50) and a second floor hinge (53) on the passenger car side by side, and the horizontal distance between the first seat framework body and the second seat framework body is 32 mm.