The invention relates to a heating system, which comprises a plurality of heating units connected in a circuit in parallel, wherein each heating unit comprises an automatic alarming device and a plurality of floor heating plates, and the automatic alarming device and the plurality of floor heating plates are connected in series; each floor heating plate is manufactured by electric conduction concrete; electrode networks are embedded into the floor heating plates; all electric conduction concrete plates in each heating unit are connected with copper conductors bound with the end part of the electrode network in series; a plurality of electrode networks are evenly distributed in the floor heating plates; the plurality of heating units are arranged in a lateral direction, and a longitudinal gap is reserved between two adjacent heating units; all floor heating plates in each heating unit are arranged in sequence in a longitudinal direction, and a mortar joint is reserved between two adjacent floor heating plates in the same heating unit. The invention also relates to a construction method for the heating system and a preparation method for the electric conduction concrete floor heatingplate. The heating system, the construction method for the heating system and the preparation method for the electric conduction concrete floor heating plate have the advantages of good heating effect and belong to the technical field of electric conduction concrete.