The invention discloses a TE die polarization analyzer based on a symmetrical three-waveguide directional coupler structure; the polarization analyzer comprises a silicon-based substrate (9), a buried oxide (10), a polarization analyzing part (15) and an upper cladding (11) arranged from bottom to top; the buried oxide (10) grows on the top surface of the silicon-based substrate (9); the upper cladding (11) covers the top surface of the buried oxide (10); the polarization analyzing part (15) horizontally grows on the top surface of the buried oxide (10), and is covered by the upper cladding (11); the polarization analyzing part (15) comprises an input channel (1), a middle path direct through channel (2), a left path direct through channel (4), a left path C-type bending channel (5), a right path direct through channel (6), a right path C-type bending channel (7) and an output channel (3); the TE die polarization analyzer is low in insertion loss, high in extinction ratio, large in work bandwidth, and compact in structure.