The invention relates to a paint spraying device, in particular to a multifunctional energy-saving paint spraying device for a building. The multifunctional energy-saving paint spraying device for the building can save time and labor, is easy to operate and can improve the paint spraying effect. In order to achieve the technical goals, the multifunctional energy-saving paint spraying device for the building comprises a
cart, a fixing plate, a support, a paint tank, a motor, a large belt
pulley, a rotating rod, a first
bevel gear, a water tank, a supporting rod, an air
exhaust pipe, an
air pump, a small belt
pulley, a flat belt, a fan, a third bearing block, a second bearing block, a first bearing block, a rotary shaft, a second
bevel gear, a screw, a first nut, a second nut, a second air cylinder, an air suction hood, a second hose, a first air cylinder, a
sprayer, a liquid pump and a first hose. The fixing plate, the support and the paint tank are arranged on the
cart sequentially from left to right. The multifunctional energy-saving paint spraying device for the building can achieve the effects of improving the paint spraying effect, saving time and labor and being easy to operate.