The invention discloses a parallel connection fluidized bed dry separation device and method. The device is composed of a main fluidized bed and an auxiliary fluidized bed which are connected in parallel. The main fluidized bed is connected with the bottom of the auxiliary fluidized bed through a bent pipe. The device is used for granule reciprocated transfer to form granule oscillating circulation. Fluidized air exhausted from the top is converged through a pipeline and then exhausted out of the device. A valve is arranged at the bottom of the auxiliary fluidized bed to control the granule transfer speed. The method comprises the steps that granule oscillating circulation is formed in the fluidized beds connected in parallel through the granule characteristics of materials to be separated, the superficial gas velocity in the main fluidized bed and the superficial gas velocity in the auxiliary fluidized bed produce cyclical fluctuations with opposite trends, then granules to be separated produce relative sliding movement in the main fluidized bed and the auxiliary fluidized bed due to density difference or granule diameter, and finally granule separation is achieved. According to the device and method, fluctuation of superficial gas velocity inside the beds and bed layer self oscillation can be achieved with no external vibration equipment, and granule separation is achieved.