The invention discloses a construction work class recruitment system based on an Internet social platform, and the system comprises an information obtaining module which is used for obtaining recruitment information inputted by a recruitment company and transmitting the recruitment information to an information display module; an information display module used for receiving and displaying recruitment information, a preset fund amount and a preset group contact way; an action recognition module used for recognizing a selection action of an applicant on the recruitment information and sending aselection determination instruction to the information display module, so that the information display module displays a preset fund amount; a fund acquisition module used for acquiring an actual fund amount input by the applicant according to a preset fund amount; and a judgment and comparison module used for judging the size of the actual fund amount and the preset fund amount, and sending a fund determination instruction to the information display module when the actual fund amount is not less than the preset fund amount, so that the information display module displays a preset group contact way, and an applicant joins in a corresponding group.