Provided is a method and system for collecting clinical trial data based on blockchain, and the method of collecting clinical trial data based on blockchain includes the steps of: receiving the clinical trial data from a researcher terminal; requesting verification of the received clinical trial data from a verification node; performing consensus verification on a verification result when the verification result according to the verification request is received from the verification node; and propagating the clinical trial data to the verification node according to a result of the consensus verification, performed by a platform.