The invention relates to a random frequency hopping method, a communication device and a random frequency hopping system. The stochastic frequency hopping method comprises the steps that a first communication device sends device information of the first communication device to a second communication device through a frequency matching channel; the first communication device receives frequency matching information sent by the second communication device; the first communication device sends synchronization information to the second communication device through a synchronization channel; the first communication device receives reply information which is sent by the second communication device and corresponds to the synchronization information; the first communication device switches a current communication channel to a first channel in a preset frequency band at interval time t, and the first communication device sends communication data to the second communication device through the first channel, wherein the first channel is the channel corresponding to a number of a random sequence in the preset frequency band, the numbers of the random sequence and the channels in the preset frequency band are in one to one correspondence, and the numbers of the random sequence are generated according to the device information of the first communication device.