The present invention provides a window mounted wireless terminal apparatus, comprising a main body for receiving signals, a holder, and a rotary base, wherein the main body for receiving signals is mounted at one end of the rotary base, one other end of the rotary base is detachably connected to one end of the holder through a fastening assembly and is horizontally rotatable on the holder, and a fixing device used for being fixed on a window body is installed on one other end of the holder. According to the present invention, an angular orientation of the main body is positioned to accurately correspond to a wireless signal transmitting angle of an outdoor communication base station. The present invention has the advantages of strong capability for wireless signal receiving and convenience in adjustment and installation.