A straw binding device, comprising a bottom plate, the upper surface of the bottom plate is fixedly connected with a fixed plate, and two arc-shaped clamping plates are rotatably connected to the fixed plate, and the inner side walls of the clamping plates are equipped with The upper end of the clamping plate is fixedly connected with a vertical plate, the opposite side walls of the two vertical plates are provided with threading grooves, one side of the vertical plate is provided with a baffle, and the baffle The lower end of the plate is fixedly connected to the upper surface of the base plate, a cylinder is fixedly connected to the side wall of the baffle, a spring is arranged inside the cylinder, and one end of the spring is fixedly connected to the side wall of the baffle, and the The other end of the spring is fixedly connected with a block, the block is slidably connected to the inner side of the cylinder, and the end surface of the block away from the spring is in contact with the side wall of the riser. It realizes effective bundling of straws, and at the same time, the structure of the device is simple, so this kind of straw bundling device is worth popularizing.