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This utility model relates to the technical field of floor grinding equipment, and discloses a cycloidal assembly and its floor grinding robot. The assembly includes a connecting part, a first swing arm, a second swing arm, a first hook, and a second hook. The connecting part is connected to one end of the first swing arm, the middle of the first swing arm is pivotally connected to one end of the second swing arm, and the other end of the second swing arm is connected to the second hook. The first hook is disposed on the first swing arm and is located between the second swing arm and the connecting part. The connecting part is used to pivotally connect the floor grinding robot. By using the cycloidal assembly, the power cord can be properly fixed at the end near the floor grinding robot. Simultaneously, the power cord gains horizontal rotational freedom by following the swing of the second swing arm, solving the problem of the power cord easily getting caught in the bottom of the floor grinding robot during movement. It also solves the problem of restricted movement of the floor grinding robot if the power cord is fixed.