The invention relates to a 
design technology of a horizontal polarization 
omnidirectional antenna with an adjustable lobe 
elevation angle, which solves the problems of the traditional horizontal polarization 
omnidirectional antenna, such as fixed 
pitch face wave beam directing, low 
antenna gain and 
high impedance matching difficulty. The antenna comprises a top-end reflection plate, a micro-strip antenna, a bottom-end reflection plate and supporting medium columns, wherein the micro-strip antenna consists of four arc-shaped micro-strip dipoles which are arranged along the circumstance; 
metal plates on the top end and the bottom end are arranged on the upper side and the lower side of the micro-strip antenna; the sizes of the upper 
metal plate and the lower 
metal plate can change the directing of the 
pitch face wave beam; the micro-strip antenna is clamped between flanges of the medium columns on two sides and is fixed by bolts; and a hole is punched at the middle part of the lower metal plate and a feed cable can pass through the hole. The 
standing wave of the antenna is less than 1.5 within 10% of relative 
frequency band, 
gain in an 
azimuth plane is higher than 2.3dB, 
gain fluctuation is less than 1dB, a 
cross polarization level is lower than -30dB, and wave beam directing is adjustable. According to the 
design technology, the 
antenna gain, the 
impedance matching, the 
cross polarization performance and the anti-interference performance of the top end and the bottom end of the antenna are improved. The 
design technology is suitable for the fields, such as 
broadcasting communication and 
electronic countermeasure.