Narrowband optical filters with flexible tunability are key components for integrated reconfigurable wavelength division multiplexing and microwave photonic systems to cope with diverse signals and interference. However, providing recon f igurability while preserving ultra-narrow bandwidth remains challenging. Here we present a Mach-Zehnder interferometer (MZI)-coupled microring filter based on thin-film lithium tanta late (TFLT), showing the ability to control bandwidth, extinction ratio (ER) and resonance wavelength. After electrode integration, the device maintains a minimum bandwidth of 63 MHz. The f ilter supports continuous bandwidth tuning from 63 MHz to 1.4 GHz and ER control from 0 to 20 dB. In addition, it performs wavelength tuning ability with an efficiency of 1.29 pm/mW, making it suitable for handling interference signals within a wide frequency range. This device is promising for reconfigurable optical communications, dynamic channel management, and on chip narrowband optical microwave filtering and interference mitigation.