Internet of Things sensing node charging delay reducing method and system

The invention relates to an Internet of Things sensing node charging delay reducing method and system. The method comprises the following steps: in a first step, total charging time is taken as an object function, that energy charged via each sensing node is not less than a threshold value is used as a constraint condition, and a linear optimization model for total charging time minimization is built so as to obtain the positions and the number of wireless charging devices; if the positions and the number of the wireless charging devices cannot be obtained, then a step two is carried out; otherwise, a step three is carried out. In the step two, the scope of the positions of the wireless charging devices is narrowed down, and an attempt to obtain the positions and the number of wireless charging devices is made via use of the linear optimization model. In the step three, the whether the number of the wireless charging devices surpass a preset number is determined; if yes, a step four is carried out; if no, ope