The objective of the invention is to solves problems in the prior art and the invention provides a combined type CT polarity detector having the remote control function. The detector comprises a direct-current signal power supply device which is electrically connected with a CT primary side, and a CT polarity display device which is electrically connected with a CT secondary side. The direct-current signal power supply device comprises a first box body. A CT primary side electrical connection piece, a remote control signal receiving device and a repeated charging type storage battery are arranged in the first box body. The direct-current signal power supply device is electrically connected with the CT primary side via the CT primary side electrical connection piece. The remote control receiving device comprises a remote control switch. The CT primary side electrical connection piece is serially connected with the remote control switch. The whole body formed after the CT primary side electrical connection piece is serially connected with the remote control switch is connected with the repeated charging type storage battery. The portable CT polarity display device comprises a second box body. A CT secondary signal receiving and processing device and a remote control signal emission device are arranged in the second box body. Thus, safety and portability of the CT polarity detection are improved.