The invention discloses a method for measuring the permeability coefficient in a rare earth ore leaching process. The method comprises the following steps: preparing an ore leaching container; putting a rare earth sample fetched on the site into the ore leaching container for saturation; before ore leaching, fetching standard ore leaching liquid of a certain amount and testing the pH value thereof as a standard pH value; taking one drop of the solution leached in a measuring cylinder with a dropper onto pH test paper every 0.5-1 hour, testing the pH value of the solution leached in the measuring cylinder, and comparing with the standard pH value; turning on a control knob to start ore leaching; recording the (delta)h and Q in unit time every 0.5-1 hour, and testing the pH value of the leachate; and calculating the permeability coefficient according to the formula K=(Q*L)/(A*(delta)h*t). In the invention, a practical and effective technical scheme is offered, and the true condition of the permeability coefficient in an ion-type rare earth ore leaching process is obtained.