The invention discloses a traditional Chinese medicine crushing and screening device. The device comprises a base plate, a box, a collecting frame, a motor, crushing blades, a screen, a crankshaft, afirst belt wheel, a second belt wheel, a belt connector, a spiral pipe, a second connecting rod shaft neck, a second sleeve, a second connecting rod, a piston rod and a piston. The device is providedwith the motor, the crankshaft, a first connecting rod shaft neck, a first connecting rod and the screen for cooperation to drive the screen to move left and right so as to improve the screening efficiency, and is provided with the second connecting rod shaft neck, the second sleeve, the second connecting rod, the piston, a cylinder block and the spiral pipe for cooperation to continuously suck air into the cylinder block from an intake pipe; then, the air enters the spiral pipe from an exhaust pipe, and is sprayed out from an air spraying hole to intermittently blow traditional Chinese medicines on the screen to the crushing blades; the traditional Chinese medicines are crushed again through the crushing blades to improve the crushing efficiency; and meanwhile, the traditional Chinese medicines blocked in meshes of the screen can be blown off to prevent blockage of the meshes of the screen, so that the screening efficiency is further improved.