A telescopic table board positioned with a resilient pin is provided, which is characterized by the following features: The telescopic table board includes a left table board and a right table board slidely nested with each other; as for the left table board and the right table board, one of them is fixedly provided with a rack, while the other with a corresponding seat bore, in which is a resilient pin positioned, which is mainly composed of a positioning fastener and a spring; the positioning fastener is provided at the head with a tooth head engaged with the corresponding rack, extends at the tail through the seat bore, and is provided at the tail end with a handle; and the spring is sleeved onto the positioning fastener, and functions between the positioning fastener and the seat bore, thus constituting the resilient-pin type telescopic positioning mechanism between the left table board and the right table board. The present utility model endows the operation table board or gangplank with the telescopic function, thus enhancing versatility and satisfying different requirements for length of the table board (gangplank) on various application occasions.