A new approach to generate frequency doubled triangular waveform signals is proposed and verified through the combination of carrier suppression modulation and semiconductor laser injection locking. In the scheme, the continuous wave emitted by the external cavity tunable laser is modulated by a sinusoidal signal through Mach-Zehnder modulator to suppress the optical carrier. The modulated signal is divided into two branches. One signal remains unchanged and the other is launched into a distributed feedback laser to select and amplify higher-order harmonic components for six-fold signal generation. After controlling the relative phase and power ratio of the two signals, we achieve frequency doubled triangular waveform by overlapping the signals in the photodetector. In the experiment, sinusoidal modulation signals at the frequencies of 3 GHz and 4 GHz are applied to generate full duty frequency doubled triangular waveform with a frequencies of 6 GHz and 8 GHz successfully. Both theoretical analysis and experimental results prove that the scheme is feasible. It is a simpler and more efficient way to avoid the complex spectral line operation. Moreover, it has a distinct advantage in high-frequency triangular waveform generation.