Traditional optical fiber pressure sensors face challenges such as susceptibility to temperature interference, complex structures, and poor stability. In this paper, we demonstrate a temperature self-reference pressure sensing system based on intracavity sensing of fiber ring laser. The sensing head, which consists of a cascaded Fabry-Perot interferometer and a fiber Bragg grating, is coupled into a fiber ring laser. The Fabry-Perot interferometer is sensitive to both pressure and temperature. The fiber Bragg grating can not only serve as a narrow-band filter but also exhibit excellent temperature response characteristics. The reflection loss of the system is modulated by varying gas pressures. By measuring the output power of the laser, simultaneous measurement of pressure and temperature can be achieved. Furthermore, a temperature reference function is established to eliminate temperature interference. The experimental results indicate that the sensing system not only enables high-resolution measurement of pressure but also possesses temperature self-referencing capability. Besides, the system exhibits excellent stability. The designed temperature self-reference pressure sensor shows broad application prospects in harsh environmental monitoring fields such as marine and chemical engineering.