The invention discloses a method for detecting cement dosage in a core test sample of a cement mixing pile, which comprises the following steps: directly mixing a field in-situ soil sample with water content without major changes into cement slurry with the same water-cement ratio during field construction, and preparing the test sample into the standard cylindrical test sample with unconfined compressive strength; placing the test sample in same-level in-situ plain soil for extrusion, sealing and maintenance after molding; carrying out EDTA titration after achieving the preset age, obtainingan attenuation law curve of consumption of disodium EDTA along with the age, and establishing standard curves in all the ages according to the attenuation law curve; and determining the consumption of EDTA in the sample, checking the cement dosage from the standard curve, and finally obtaining the cement dosage in the core test sample of the cement mixing pile. The method has simple operation, accurate detection result, good stability and good repeatability.