The invention belongs to the technical field of entertainment equipment and discloses a draw hook device for a roller coaster and with a stretching and contraction controlling function. The device comprises a support, a shaft, a switch, a traction hook, a tension spring and a spring bolt mechanism, the shaft, the switch, the traction hook, the tension spring and the spring bolt mechanism are installed on the support, and the draw hook is provided with a shaft hole, a tension spring connection block and a pull handle; the support is provided with a cavity, the shaft penetrates through the shafthole of the draw hook to install the draw hook in the cavity of the support, one end of the tension spring is fixed to the support, and the other end of the tension spring is fixed to a tension spring connection block of the draw hook; the spring bolt mechanism hinders the draw hook to rotate out of the cavity of the support around the shaft; the switch is connected with the spring bolt mechanismand also connected with the pull handle of the draw hook. According to the draw hook device, stretching and contraction control over the draw hook can be achieved, the roller coaster can conduct traction or retreating motion multiple times through the hook, the draw hook cannot cause hidden safety dangers, and the trajectory form of the roller coaster has high diversity.