The invention relates to a precision active phased-array radar antenna frame which is characterized in that a giant frame is composed of an upper transverse beam, a right vertical beam, a lower transverse beam and a left vertical beam, the upper transverse beam, the right vertical beam, the lower transverse beam and the left vertical beam are in rivet connection through corner fittings, a T-shaped structure is composed of a combination vertical beam and a combination transverse beam, the combination transverse beam is connected between the right vertical beam and the left vertical beam in an across mode, the combination vertical beam is connected between the combination transverse beam 8 and the lower transverse beam in an across mode, an antenna installation base plate is fixedly connected to a frame structure composed of the upper transverse beam, the right vertical beam, the left vertical beam and the combination transverse beam, and a plurality of guiding transverse beams are installed inside the frame structure composed of the upper transverse beam, the right vertical beam, the left vertical beam and the combination transverse beam. The precision active phased-array radar antenna frame is good in rigidity, light in weight and attractive in appearance, and meanwhile meets the requirements for blind-plug fit connection and the like between considerable antenna oscillators and considerable receiving and transmitting units.