The invention provides a protection method for side channel attack and fault attack. The protection method comprises the following steps of I. dividing operation of block cipher algorithm into a plurality of stages of pipelines; II. inputting real plaintext into two stages of pipelines selected at random, and inputting random number into other stages of pipelines; III. carrying out operation, and then comparing whether the operation results of the two real data are consistent after the operation is finished. The protection method can resist both side channel attack and fault attack, and has strong safety and high execution efficiency.