Abstract: In order to solve selection problem of liquid level detecting equipment in flotation control process, basic structure, working principle and application in separation field of common liquid level detecting equipments in flotation process were analyzed and compared including buoyancy type level gauge, laser level gauge, static level gauge and ultrasonic level gauge from the perspective of actual use. The analysis comes to a conclusion that each detecting equipment has own advantages and disadvantages for differences of sensors performance, stability of attachment devices and measured medium, thus concrete situation in flotation process, maintenance situation, performance of detecting equipment and cost of installation and use should be involved in concerning of selection of level detecting equipment.