The invention provides a multi-sampling judgment method for fault-tolerant filtering based on remainder check, which solves the problem of residual error in a fault-tolerant filtering method based on remainder check in the prior art. When filtering output data of a first branch circuit are unequal to filtering output data of a second branch circuit but the filtering output data of the two branch circuits are the same by obtaining a remainder after division, and one error branch circuit cannot be judged once, the data can be temporarily stored in a cache, other data are continued to be processed and subjected to multiple judgment until one datum in the data by obtaining the remainder after division of the filtering output data of the first branch circuit and the filtering output data of the second branch circuit is not the same as a reference datum, and at the time, the branch circuit in error and the branch circuit with a correct processing result can be judged, so that the problem of residual error is avoided.