The invention relates to a signal booster, comprising a power supply used for providing 220V voltage to an indoor host; an indoor adjustable host used for adjusting indoor signal strength, tolerance, power, rated gain and other numerical values; an indoor and outdoor omnidirectional transceiver antenna, mainly used for importing an outdoor signal, amplifying the outdoor signal through a downlink and accessing the outdoor signal to indoors for compensating the blind point of a base station, then amplifying the signal through an uplink and transmitting the signal to the base station to achieve mobile phone call and data transmission. According to the invention, by means of the relay and the amplification of the uplink signal, the onsite problem that can only be solved under the assistance of a third party is solved, the entire scheme is simple to implement, the practicability is high, and the promotion and application values are very huge.