The invention discloses a bracket plate of a flue gas charge device, belongs to the technical field of flue gas particle charge dust removal brackets, and aims to solve the technical problem of providing a bracket plate which is convenient to mount, easy to operate and low in cost. The adopted technical scheme is that: in the bracket plate of the flue gas charge device, a plate body is provided with a plurality of concave grooves and a plurality of through grooves in parallel; the concave grooves and the through grooves are formed at intervals; and the plate body is made of insulating materials. A positive electrode plate and a negative electrode plate of a pre-charge device are conveniently arranged and fixed, the operation is easy and the electrode plates are only required to be inserted into the grooves to finish mounting; and thus, over-many mounting members are avoided, and the cost of the brackets is also reduced.