Embodiments of the present invention disclose a method for regulating transmit power and a wireless routing device, which relate to the field of wireless communications technologies, and can adjust transmit power according to a current work category of a wireless routing device in a wireless local area network, thereby ensuring transmission strength of a radio wave or saving electrical energy, and improving user experience. The method in the present invention includes: determining, by a wireless routing device, a data type of to-be-transmitted data; when the data type of the to-be-transmitted data is uplink data, selecting, by the wireless routing device, first transmit power to send the to-be-transmitted data on a preset channel Channel; and when the data type of the to-be-transmitted data is downlink data, selecting, by the wireless routing device, second transmit power to send the to-be-transmitted data on the preset channel Channel.