The purpose of the invention is to provide a signal enhancement shell of a smart-phone. The signal enhancement shell of the smart-phone comprises a shell; placing grooves are formed in the left and right ends of the inner bottom of the shell; telescopic antennas which can be drawn out are arranged in the placing grooves; the bottom ends of the telescopic antennas in the placing grooves at the left and right ends are jointly connected with a connecting strip; the connecting strip is stuck to the bottom of the shell; a magnetic connecting strip is arranged at the bottom end of the connecting strip; a mounting strip is arranged at the inner top part of the shell; a magnetic contact strip is arranged at the top part of the mounting strip; and the magnetism of the magnetic contact strip is opposite to the magnetism of the magnetic connecting strip. By placing the phone in the shell, pulling down the connecting strip and drawing out the telescopic antennas when signals induced by a signal intensity induction lamp are weak, sucking the magnetic connecting strip at the bottom end of the connecting strip to a magnetic contact board at the top end of the shell to enable the telescopic antennas to be located above the shell and plugging a plug into the earphone hole of the smart-phone, the signals of the smart-phone can be enhanced. The signal enhancement shell of the smart-phone is convenient to operate, convenient to carry and suitable for signal enhancement of the smart-phone.