The invention discloses a reconfigurable elliptic curve cipher processor which comprises a control unit, a data path unit and an input/output unit, wherein the control unit is used for finishing the access of an instruction, the decryption of the instruction, the generation of the address of an instruction memory and the correct execution of the internal instruction and the external user command of a coordination processor; the data path unit comprises a vector register stack subunit, a plurality of vector function subunits, a configuration register subunit and a write-back subunit, wherein the vector register stack subunit is used for storing data on which elliptic cipher processing is to be carried out; the vector function subunits are used for carrying out corresponding operational processing on the data of elliptic cipher processing according to a coordination instruction of the control unit; the configuration register subunit is used for receiving a reconfigurable configuration instruction output by the control unit and carrying out reconfigurable configuration on the operation of the function subunits; the write-back subunit is used for transmitting the output data and the write-back data of the function subunits back to the corresponding vector register stacks; and the input/output unit is used for realizing the input of the data on which the elliptic cipher processing is to be carried out and the output of a processing result. The invention is used for enhancing the processing flexibility and efficiency of the elliptic curve cipher processor.