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As an important passive optical device, long-period fiber grating (LPFG) is widely used in the field of optical fiber communication and sensing due to its unique performance and advantages. In recent years, many different LPFG manufacturing methods have been published, but product reliability is still a key problem to be solved. A CO2 laser melt stretching method is proposed to prepare long-period fiber gratings, which improves the problem of writing failure caused by various factors in the preparation of LPFG. This method uses CO2 laser to heat and soften the fiber, pull down the taper under the constant tension of the stepping motor, and repeatedly heat and stretch at the position of one grating period at the center of the previous taper, and obtain the maximum attenuation peak at the wavelength of 1539 nm, Long-period fiber grating with peak value greater than 15dB improves the success rate and consistency of LPFG preparation. The reliability of the product is verified, and its sensitivity to temperature and axial stress is tested. This research has great application potential in optical fiber laser system and its applied optical devices.