The invention discloses a linear drainage ditch integrating dirt intercepting and permeating functions. The linear drainage ditch comprises a ditch body, a grate cover and a dirt intercepting device. The grate cover is transversely arranged on the ditch body, an expansion groove is formed in the ditch body and used for expanding the water volume of the dirt intercepting device, and the dirt intercepting device is used for carrying out dirt intercepting treatment on water drained into the drainage ditch. According to the technical scheme, the dirt intercepting purifying requirement of rainwater can be met, and meanwhile the permeating function of the rainwater can be achieved.