The utility model provides a prefabricated constructional column, includes steel bones RACK and pours the constructional column concrete outside steel bones RACK, the constructional column concrete has been pour to the outside length of leading to of steel bones RACK, steel bones RACK's both ends surpass the both ends of constructional column concrete to steel bones RACK's top is connected with the upper junction plate that the level set up, and steel bones RACK's bottom is connected with the lower connecting plate that the level set up. The utility model provides a traditional cast in situ concrete constructional column to pour the quality poor, the construction is difficult to and extravagant manual work and template materials's technical problem.