The invention discloses a fuel pump and a phase sensor device thereof. The phase sensor device comprises a signal panel, a fuel pump gear and a phase sensor; the signal panel is provided with signal teeth, the fuel pump gear can fixedly sleeve a rotary shaft of the fuel pump, and the signal panel is coaxially fixed to the fuel pump gear; the phase sensor is arranged on the side portion of the signal panel, and the position of the signal panel is determined according to the signal teeth. According to the provided phase sensor device, the signal panel is fixed to the fuel pump gear, so that thephase sensor device has a large assembly space, installation convenience of the phase sensor device is improved, the later change cost is reduced, and the electronic control phase angle is conveniently changed in the later period.