A microwave transmitter, wherein the microwave transmitter comprises a power detector, a controller, at least two correction modules, and at least two signal processing modules, wherein a) a signal input end of each signal processing module is electrically connected to a signal output end of a corresponding correction module, and the controller is separately electrically connected to a control end of each correction module and the power detector; b) the power detector is configured to: detect an in-phase/quadrature, I/Q, signal output by any one of the at least two signal processing modules, to obtain power detection information, and send the power detection information of the I/Q signal to the controller; c) the controller is configured to: send different parameter values of an adjustment parameter to a target correction module, receive power detection information that is corresponding to each parameter value and that is sent by the power detector, determine an optimal parameter value corresponding to the target correction module from the parameter values based on the power detection information corresponding to each parameter value, and send the optimal parameter value to the target correction module; and d) the target correction module is configured to: perform, based on the parameter values of the adjustment parameter that are sent by the controller, signal adjustment on an input I/Q signal, and send the adjusted I/Q signal to a target signal processing module connected to the target correction module, wherein the received power detection information is power detection information of an I/Q signal output by the target signal processing module when the target correction module performs signal adjustment based on each parameter value sent by the controller, the target signal processing module is a signal processing module electrically connected to the target correction module, the adjustment parameter comprises at least a balance adjustment parameter, and the target correction module is any one of the at least two correction modules. a) a signal input end of each signal processing module is electrically connected to a signal output end of a corresponding correction module, and the controller is separately electrically connected to a control end of each correction module and the power detector; b) the power detector is configured to: detect an in-phase/quadrature, I/Q, signal output by any one of the at least two signal processing modules, to obtain power detection information, and send the power detection information of the I/Q signal to the controller; c) the controller is configured to: send different parameter values of an adjustment parameter to a target correction module, receive power detection information that is corresponding to each parameter value and that is sent by the power detector, determine an optimal parameter value corresponding to the target correction module from the parameter values based on the power detection information corresponding to each parameter value, and send the optimal parameter value to the target correction module; and d) the target correction module is configured to: perform, based on the parameter values of the adjustment parameter that are sent by the controller, signal adjustment on an input I/Q signal, and send the adjusted I/Q signal to a target signal processing module connected to the target correction module, wherein the received power detection information is power detection information of an I/Q signal output by the target signal processing module when the target correction module performs signal adjustment based on each parameter value sent by the controller, the target signal processing module is a signal processing module electrically connected to the target correction module, the adjustment parameter comprises at least a balance adjustment parameter, and the target correction module is any one of the at least two correction modules.