The invention discloses a multi-mode set multi-purpose hydrometric cableway flow measurement device and method. The device consists of a self power generating system, a water quality self measuring system, a self early warning system and a signal self transmission system. The Fourier transformation infrared spectrum is used for detecting a self collection water sample; the real-time observation on the water quality of the measured cross section water body is realized; an armature winding is installed and embedded in an improved hydrometic propeller in a matched way to form a bearing of a motor rotor; an iron core and a stator winding are installed and embedded to form a shaft sleeve of the motor stator; the self power generation function between the stator and the rotor under the excitation effects is realized; a wireless electromagnetic sensor is matched for realizing the goal of meeting the data normal transmission and storage under the condition of wireless data transmission failure. The device and the method can be widely applied to various kinds of cable flow measurement processes of hydrological stations; the multi-mode multi-angle and multi-function purpose of the self power generation flow measurement, self monitoring on water quality condition, self transmission of flow speed and water quality signal data and self early warning can be achieved under the emergency conditions (such as the conditions of power supply equipment water damage and sudden power failure).