The invention discloses a flexible wearable optical fiber sensor and a human dynamic whole body distributed monitoring method. A human dynamic whole body monitoring system comprises a demodulator, a host computer, and a plurality of the flexible wearable optical fiber sensors, wherein the flexible wearable optical fiber sensor is composed of a flexible bending optical fiber module, a first fiber Bragg grating, a second fiber Bragg grating and a fiber Bragg grating protection structure. The fiber Bragg grating wavelength division multiplexing technology is used, the plurality of the flexible wearable optical fiber sensors are connected in series and fixed to a user's body through Velcro and elastic bands, and the user's movement status, including a joint bending angle, a muscle stretching amount, a respiration rate and other physiological parameters, is monitored. The recognition of stretching and bending degrees is realized by detecting the change of the light intensity corresponding to an fiber Bragg grating spectral signal center wavelength, physiological parameters such as a joint bending angle, a muscle stretching amount and a respiration rate are monitored in real time when the human body is active, high precision and sensitivity are achieved, and the flexible wearable optical fiber sensor has a simple structure, and can be worn freely without affecting the user's movementfreedom degree.