The utility model provides an electronic keyboard musical instrument. The shell of the electronic keyboard musical instrument is divided into a main shell which comprises a bottom board and a front clamping board and a rear shell which at least comprises a back board, wherein the real shell is detachably connected to the main shell; the shell also comprises a top board which forms the upper surface of the shell, a left side board and a right side board, and the left side board and the right side board are positioned at the left side and the right side of the keyboard and extend upwards from the bottom board; the rear shell also comprises a reinforcing board connecting the top board and the back board, the reinforcing board and the bottom board are fixed by means of a fixing device which is provided with the bottom board and kept between the lower end of the reinforcing board and the lower edge of the back board, and thus, the main shell and the rear shell are mutually connected. The electronic keyboard musical instrument with the configuration enables the shell of the musical instrument to be easily assembled and obtain good appearance, and contributes to the repair of the interior of the shell.