The invention discloses a wood preservative coating and brushing device. The wood preservative coating and brushing device comprises a box body, a clamping device, a paste storage device and a brush plate; sliding ways are arranged on the two sides of the box body; the clamping device comprises two rotating shafts, two electric pushing rods and clamps; one end of each of the two electric pushing rods is connected with the corresponding rotating shaft; the clamps are arranged at the other ends of the two electric pushing rods; the two rotating shafts are respectively arranged in the sliding ways on the two sides of the box body; the clamps can clamp wood; the electric pushing rods and the clamps can rotate through the rotating shaft; the paste storage device is arranged at the top of the box body; the brush plate is communicated with the bottom of the paste storage device through a flow guide pipe, and comprises a flow guide plate and a brush body; the flow guide plate is communicated with the flow guide pipe; the brush body is arranged on the flow guide plate; the paste storage device stores preservative paste. The wood preservative coating and brushing device can prevent the wood from being corroded, ensure the service life of the wood, and meanwhile, is simple in structure, convenient to operate and reliable to use.