Abstract: Due to seasonal nature of grain harvesting operations and conditions of climate and geography，field test of grain harvesting machinery research and development process has a lot of restrictions，resulting in long design cycle and key design parameters difficult to be obtained，etc.Therefore，it has an irreplaceable role in grain harvesting machinery research and development process to obtain relevant design parameters of harvesting machinery from bench test though test platform.Development of harvesting mechanics test platform of rice，wheat，maize，millet and other crops was analyzed，from structural composition，structural innovation，functional purposes，bench test research and other aspects.Meanwhile，future development trend of grain harvesting machinery and its experimental research platform was looked foruard，which played an important role to improve research and development level of agricultural harvesting machinery.