The invention discloses a tuna tracking float acoustic anti-theft device. A tracking float is used for fixing driftwood used for tuna seine catching. The tracking float is a satellite tracking floating float, and is composed of a satellite transceiver, a GPS, a fathometer used for probing fish schools, a temperature sensor, a magnetic switch, a solar cell panel and or a storage battery and a solid shell. The acoustic anti-theft device is arranged in the tracking float and is provided with a hydrophone used for monitoring noise under water, the output end of the hydrophone is sequentially connected with a signal amplifier, a band-pass filter, an A / D converter and a DSP micro processor, and the DSP micro processor carries out feature extraction and goal recognition on the noise under water according to a stored underwater noise sound feature library and a mode recognition library of a conventional ship engine.