The invention relates to a common-path interference electric field sensor with stable temperature of quiescent operating point and belongs to the technical field of optical electric field measurement.The common-path interference electric field sensor comprises a lithium niobate crystal, a titanium-diffused lithium niobate waveguide, electrodes and an antenna; a propagating direction of the titanium-diffused lithium niobate waveguide is z axis; titanium dioxide is used as a magnetron sputtering target to perform magnetron sputtering on the upper surface of the titanium-diffused lithium niobatewaveguide; magnetron sputtering pressure is 2.5-5 millitorrs; magnetron sputtering time is 2-16.5 hours; titanium dioxide film is formed on the upper surface of the titanium-diffused lithium niobatewaveguide. The titanium-diffused lithium niobate waveguide is coated with a layer of titanium dioxide film; positive temperature coefficient of the titanium-diffused lithium niobate waveguide is compensated without affecting original measurement sensitivity and accuracy of an existing sensor; therefore, temperature stability of the quiescent operating point of the sensor is greatly improved.