The utility model discloses a topsoil depth measurement scale, and belongs to the technical field of measurement. The measurement scale includes a sizing 1, a fixed hoop 6, and a vernier 9, wherein the sizing 1 is provided with a longitudinal level bubble observation window 2, a horizontal level bubble observation window 3, scale 4, and a guide chute 5; the vernier 9 is placed in the guide chute 5; the sizing 1 and the vernier 9 are sleeved by the fixed hoop 6, and the vernier 9 and the sizing 1 are pressed by a bolt 8 on a threaded hole 7. For measurement, the scale is placed on the surface of unploughed soil, and is adjusted to be horizontal by adjusting horizontal and longitudinal bubbles. The bolt is loosened, and the guide chute is used to control the vernier to move vertically and steadily. When the vernier makes contact with the hard surface of the ploughed soil plow sole, the bolt is tightened for value reading. The measurement scale has the advantages of measurement accuracy, simple structure, easy use and high efficiency, and is conductive to timely and intuitively checking and measuring quality of agricultural machinery ploughed soil with fast speed. During measuring the quality of ploughed soil work, the scale can provide reference for judging performance of operation machines. The scale is an essential measurement tool in modern agriculture standardized working management.