The invention discloses a tunable optical filter based on a winding micro disc structure. The invented device comprises a partially winding micro disc resonant cavity and an optical input or output straight waveguide connected to the micro disc resonant cavity notch. The optical transmission straight waveguides are disposed respectively at the two sides of the micro disc resonant cavity bottom, and the other ends of the two optical transmission straight waveguides are connected to two waveguide reflection mirrors which are connected with each other by an orienting coupling structure or an MMIcoupling structure. An electrode modulating area is disposed on the optical transmission straight waveguide or on the micro disc resonant cavity. The winding micro disc resonant cavity and the triangular waveguide mirror plane are combined organically with each other to implement wavelength quick selection. Devices such as a wave filter, an optical switch capable of selecting wavelength, a laser,a power divider and a modulator are implemented by adding electro-optic modulation or structure extension additionally. Different modulation area facilitates flexible modulation and implements different function requirement. The invented device is provided with a simple structure, a small size, and is easy to be integrated or extended.