The invention discloses a floating-ball slurry liquid level visual gauge. The visual gauge comprises a supporting frame, wherein a scaleplate is arranged on the supporting frame; a first bearing and asecond bearing are arranged at the top of the supporting frame; a steel wire lifting rope is arranged on the first bearing and the second bearing; one end of the steel wire lifting rope extends out of the first bearing downwards, and a pointer is arranged at the bottom of the end; and the other end of the steel wire lifting rope extends out of the second bearing downwards, and a floating ball isarranged at the bottom of the end. The visual gauge is simple in structure; through combination of the floating ball, the pointer and the scaleplate, the problems that cost price is high, and usage isnot flexible and convenient in the prior art are solved; and the change of a liquid level in a slurry pond can be accurately reflected through the floating-ball liquid level visual gauge, drilling consumption per unit time can be accurately calculated, and hydrogeological characteristics of a stratum can be accurately reflected.