The invention relates to a switch linear phase shifter based on a micro electro mechanical system (MEMS) capacitance and inductance phase shifting unit, which comprises MEMS switches, a T-shaped node, a reference phase shifting coplanar waveguide transmission line, an MEMS capacitance and inductance phase shifting transmission line, a transmission line right-angled corner, an MEMS switch electrode, a lead wire, an isolating resistor and a medium substrate. The reference phase shifting coplanar waveguide transmission line and the phase shifting transmission line embedded into an MEMS capacitor and inductor form two transmission paths of the switch linear phase shifter, the MEMS switches are arranged on the T-shaped node and used for strobing the two transmission paths, and the transmission line right-angled corner is used for connecting two sections of transmission lines perpendicular to each other. The switch linear phase shifter based on the MEMS capacitance and inductance phase shifting unit has the advantages that a phase delay unit formed by the MEMS capacitor and inductor effectively reduces integral size of the phase shifter, and a small-sized multi-digit switch linear phase shifter based on the MEMS capacitance and inductance phase shifting unit can be obtained by connecting a plurality of switch linear phase shifters based on the MEMS capacitance and inductance phase shifting unit in cascading mode.