The invention discloses a portable fluid infusion rate monitoring device. The portable fluid infusion rate monitoring device comprises a monitoring device body, a clamping arm mechanism A and a clamping arm mechanism B, the monitoring device body is provided with the clamping arm mechanism A, a clamping groove, an assembly mounting groove, the clamping arm mechanism B, a light sensor, a spring mounting groove, clamping arm handle knobs, a finger groove, spring-fixing through holes, a light generator A, a light generator B, a charging hole, a storage battery, a non-slip rubber strip, a signal receiver, a circuit board and a fixing groove, the monitoring device body is formed by the clamping arm mechanism A and the clamping arm mechanism B, and a spring is arranged between the clamping arm mechanism A and the clamping arm mechanism B to make the monitoring device body form a clip shape. The device has the advantages of reasonable design, small size, convenience in use, portability, and realization of high monitoring precision of the monitoring device body through monitoring using the two light generators.