A metal liquid level detection control device for hot type continuous casting comprises a detection electrode plate, a signal processing module, a display device, a signal adjuster, a servo mechanism and an executing device. The detection electrode plate is located above the metal liquid surface and is parallel with the metal liquid surface so that variable capacitance can be formed; the detection electrode plate and metal liquid are connected to the signal input end of the signal processing module in a conductive manner; the signal output end of the signal processing module is connected with the signal adjuster and the display device in a conductive manner; the output end of the signal adjuster is connected with the signal input end of the servo mechanism in a conductive manner; and after receiving a variable capacitance C value change signal, the signal processing module performs processing and inputs an output signal into the signal adjuster, and after the signal adjuster performs processing, an instruction is output to drive the servo mechanism. The metal liquid level detection control device for hot type continuous casting avoids adhesion between a metal liquid film or a metal oxidization film and a detection electrode, improves the detecting and controlling stability and precision, and increases the real-time detection function of the metal liquid level height.