The invention discloses a square type battery single-piece adjustable coil needle structure comprising a connection block and parallely arranged a first needle body and a second needle body, wherein mounting holes are respectively arranged on the first and second needle handles, an adjustable block is mounted in the mounting hole, a positioning hole is arranged in the adjustable block, a connection hole corresponding to the positioning hole on the connection block and crossing the positioning hole is fixed on a connection piece in the connection hole for connecting the needle handle of the first needle body and the second needle body to the connection block, the space between the first and second needle bodies is adjusted along with the open position of the adjustable hole on the adjustable block. The integral width adjustment to the coil needle is conveniently realized by selectively mounting adjustable block with different hole position adjustable holes. Thus the invention has very good practicability and universality.