The invention relates to a bill of quantities (BOQ)-based tendering and bidding management control system and a control method thereof for the technical renovation overhaul project of a power grid. Compared with the prior art, the defect that no BOQ-based centralized treatment is available for tendering and bidding data in the prior art can be solved. The method comprises the steps of drawing up abidding plan and obtaining a BOQ; downloading a bidding document; checking a bidding list; generating an evaluation standard and a method template. According to the invention, the content of the BOQis automatically converted into a controlled bidding price file, and the project cost can be reasonably controlled. Meanwhile, the rapid bidding clearing and evaluating of tendering and bidding projects for the technical renovation overhaul project of the power grid can be realized at the same time. The working efficiency and the working accuracy of the tendering and bidding management are improved.