A　photonic　multi-format　background-free　binarily　modulated　microwave　signal　generator　using　a　single　dual-polarization　dual-parallel　Mach-Zehnder　modulator　is　proposed　and　demonstrated.　The　proposed　generator　features　good　reconfiguration　and　switchability.　By　simply　adjusting　the　direct　current　biases　of　the　modulator,　amplitude　shift　keying　(ASK),　phase　shift　keying　(PSK)　and　frequency-shift　keying　(FSK)　microwave　signals　can　be　generated.　Benefiting　from　the　complementary　intensity　modulation,　there　is　no　residual　baseband　modulated　signal　in　the　generated　binarily　modulated　signals.　The　system　does　not　involve　any　optical　or　electrical　filters,　which　ensures　good　tunability　of　the　generator.　By　changing　the　frequency　of　the　driven　microwave　carrier　and　bit　rate　of　the　electrical　coded　signal,　the　frequency　and　rate　of　the　generated　multi-format　signals　can　be　adjusted　accordingly.　The　multi-format　switchable　signal　generator　has　great　potential　in　multi-functional　communication　and　radar　systems.