The invention relates to an opposite inserting type paper box baffle plate clamping vertical box filling machine. The opposite inserting type paper box baffle plate clamping vertical box filling machine comprises a feeding mechanism A, an unfolding mechanism B, a position adjustment mechanism C, a grabbing downward pressing mechanism D and a paper box conveying and positioning mechanism E. The opposite inserting type paper box baffle plate clamping vertical box filling machine has the beneficial effects that the opposite inserting type paper box baffle plate clamping vertical box filling machine is suitable for different specifications of paper box baffle plates; a clamping device is simple in structure and has very good usability compared with other clamping manners; the shapes of the paper box baffle plate can be subjected to rectangular correction within certain limits through clamping mechanisms which are parallel to each other and correspond to the specifications of the baffle plates in a spacing manner; after the grabbing downward pressing mechanism causes the paper box baffle plates to be in position, pressing plates can forcibly press the opposite inserting type paper box baffle plates into boxes filled with tanks; and the positioning errors within certain limits can be neglected.