A high efficient encryption and decryption processing device for implementing SMS4 algorithm, the output of its data registering component connects the data converting component, the constant array memory component connects the input of the data registering component, and the triggering clock connects the triggering end of the data registering component. The data registering component and the data converting component had better be composed of corresponding two or four. The external registering data inputs the first data registering component, and its output connects the first data converting component; the output of the first data converting component connects the next data registering component, and its output connects the next data converting component, and so on, connecting each data registering component and each data converting component in turn like that. Four data converting components repeat the converting process seven times, two data converting components repeat the converting process fifteen times, and then to get the encryption and decryption data processing result. The present invention solves the technical problems of data converting process in the background technique that the number of circulating times is large and encrypting efficiency is low, optimizes the integrality of the chip signal, reduces the cost of the device and enhances the interference immunity.