The invention provides a method for comparison and detection of calcined crystal seed activities. The method for comparison of calcined crystal seed activities comprises the following steps of mixing calcined crystal seeds and water according to a preset volume ratio in a container having a preset height to obtain mixed slurry, carrying out sedimentation layering, and comparing activities of the calcined crystal seeds according to the height of a lower liquid layer, wherein the activities of the calcined crystal seeds are improved with increasing of the height of the lower liquid layer. The method for comparison and detection of calcined crystal seed activities has a low cost, simple and practical processes and strong operability, and is fast and accurate.