The invention provides a microstrip line phase shifter based on LTCC technology. The microstrip line phase shifter comprises a rectangular ferrite substrate, a first coupling curved segment, a second coupling curved segment, a third coupling curved segment, a fourth coupling curved segment, a solenoid and a bonding pad, and is characterized in that, the center of the rectangular ferrite substrate is provided with a rectangular substrate window; the fourth coupling curved segments are distributed on the upper surface of the substrate, wherein the first and fourth coupling curved segments are respectively positioned on the ferrite substrate on two sides of the wide side of the substrate window, and the second and third coupling curved segments are arranged on the ferrite substrate on one side of the long side of the substrate window in parallel, the solenoid is arranged on the ferrite substrate on the other side of the long side of the substrate window and forms a winding structure with the ferrite substrate, and the head end and tail end of the winding structure are connected to the bonding pad through wires. The microstrip line phase shifter has the advantages of low insertion loss and large average power capacity, a magnetization cycle is integrated into the ferrite substrate, so that the volume of the common ferrite phase shifter is significantly reduced, and miniaturization of the phase shifter is facilitated.