A controllable polarization analyzer based on waveguide structures is one of core components in integrated photonic systems, whose output polarization state can be dynamically manipulated, and it has an important application value in integrated photonic systems. A novel controllable polarization analyzer based on deflection ridge waveguide is proposed. With the anisotropy and large birefringence of the liquid crystal material, the controllable output of transverse electric wave and transverse magnetic wave can be realized based on the electro-optical effect. The optical performance of the proposed device is numerically demonstrated by beam propagation method. The results show that the extinction ratio of the proposed system is 29.8 dB and the optical loss is only 0.002 dB, and the proposed device is insensitive to wavelength and fabrication error. The proposed device has the advantages such as simple dynamic control, easy design and fabrication and simple structure, which has wide applications in integrated photonic systems.