The utility model discloses a rectification filter circuit, lamp and LED straight tube lamp, the rectification filter circuit include: a rectifier circuit for carry out the rectification to the external drive signal, and filter circuit, be coupled with a rectifier circuit for external drive signal to after the rectification carries out filtering. LED straight tube lamp includes fluorescent tube, a rectifier circuit, filter circuit, LED drive module and diffusion diaphragm. The fluorescent tube has two pins for receive the external drive signal. A rectifier circuit is coupled two pins for carry out the rectification to the external drive signal. A filter circuit and a rectifier circuit are coupled for carry out filtering to signal after the rectification. LED drive module and filter circuit are coupled to receive post -filter signal and luminous. Filter circuit is including parallelly connected electric capacity and inductance, is coupled between two pins one of them and a rectifier circuit and presents the maximum value to the equivalent impedance of external drive signal on specific frequency.