A drawer backboard connecting device belongs to the field of furniture, and comprises a supporting board, a lateral board, a backboard and a backboard connecting block. The supporting board is arranged on a drawer guide rail, the side board is enclosed outside the supporting board, and the backboard connecting block is arranged at the tail of the supporting board; and the backboard connecting block is provided with a slot and a flexible pawl which are arranged in the vertical direction, and the backboard is also provided with a backboard insertion sheet which is provided with a through hole matched with the flexible pawl of the backboard connecting block. The drawer backboard connecting device makes the assembly and disassembly of the drawer backboard simpler and easier, avoids the shearing force of the backboard on a fastener, makes a product more compact and durable, and is suitable for all furniture.