The invention discloses a double-sound-track ultrasonic heat meter. The ultrasonic heat meter comprises a tube body, four installing ports are formed in the wall of the tube body, an ultrasonic transducer is installed on each installing port, the four ultrasonic transducers are arranged opposite in pairs, each two opposite ultrasonic transducers form a sound track, the two sound tracks with axes mutually parallel and lengths equal are symmetrically distributed on the two sides of the axis of the tube body, and the distances between the axes of the two sound tracks and the axis of the tube body are equal. In this way, the ultrasonic transducers are basically arranged in the positions where a flow field velocity is very close to mean flow velocity of the water velocity on the cross section in a tube, correction difficulty of measurement errors by a computer matched with a flowmeter can be greatly reduced, and therefore a final measurement result is accurate.