The invention discloses a millimeter-wave multi-digit miniature digital phase shifter, which is composed of a 11.25-degree phase-shift circuit, a 22.5-degree phase-shift circuit, a 45-degree phase-shift circuit and a 90-degree phase-shift circuit in cascade connection mode, and all the phase-shift circuits adopt a reflection type topological design. The phase shifter adopts 11.25-degree as a phase-shift stepping value and can totally achieve 16 phase-shift states within 0-360 degrees. The final layout of the phase shifter is typeset according to a sequence that phase-shift amount tapers gradually, and a working frequency range of the phase shifter is 34-36 GHz. The circuits of the phase shifter is simple in topology and design process, easy and convenient in manufacture technology, high in yield, small in chip area, wide in working band, low in inserting consumption, high in phase-shift accuracy and low in input and output voltage standing wave ratio, and each phase-shift state is small in inserting consumption difference.