An electrical connector fixation device having at least a connector housing and a fastening piece is proposed. The connector housing has at least a receiving portion for accommodating the electrical connector and a compressing board portion to deform the receiving portion by compression. The fastening piece is used to hold the compressing board portion and to fix the connector housing on a body of electrical device. With such design, an electrical connector is assembled in the body of electric device, so that the body of electric device is expanded with device interconnection function.