Provided is a three-level clamping type three-leg 15-switch converter topology structure. The three-level clamping type three-leg 15-switch converter topology structure comprises a direct current power supply, two capacitors connected in series, and a three-level clamping type three-leg inversion bridge formed by three legs, each bridge is formed by five switching devices with anti-parallel diodes and two clamping diodes, the five switching devices are connected in series, a cathode of the first clamping diode of the two clamping diodes is connected between the first switching device and the second switching device, an anode is connected to a reference point, and an anode of the second clamping diode is connected between the fourth switching device and the fifth switching device. According to the topology structure, the voltage stresses born by Si and MM (i=A, B, C) are invariable, and the voltage stresses born by other switching devices are all halved; with the same switching frequency, the harmonic component of output waveforms is reduced; and in the processes of switch-on and switch-off of each switching device, the switching loss of the switching devices is reduced.