Portable sag viewer

A portable sag viewer mainly comprises a telescope and a high-intensity laser transmitter, wherein telescope is connected with the high-intensity laser transmitter via a support bracket; a sight direction of the telescope is the same as a transmission direction of the high-intensity laser transmitter; the support bracket or the telescope or the high-intensity laser transmitter is connected with a base frame connected with a tower material; and high-strength magnetic steel or a fixing block capable of being fixed on the tower material is arranged on the base frame. The viewer has the characteristics that the viewer is simple in structure, convenient and reliable to use, small in size, light in weight, convenient to carry, mount and dismount, free from influence of severe weather such as haze, high in precision, and a sag is observed clearly.