Machine tool protection device capable of feeding and discharging large workpieces from top

The utility model belongs to the field of numerically-controlled machine tools, and particularly relates to a machine tool protection device capable of achieving large workpiece top feeding and discharging. The device comprises a machine tool protective cover, a left front door, a right front door and a top door assembly. The left front door and the right front door are slidably installed in frontof the machine tool protective cover. The top door assembly is composed of a flexible protective cover, a top door connecting plate, a driving air cylinder, a driving connecting plate, top door sliding rails and a scissor type connecting rod mechanism. The two top door sliding rails are arranged on the left side and the right side of a top opening of the machine tool protective cover in parallel.The top door connecting plate and the driving connecting plate are connected through a scissor type connecting rod mechanism, act on the top door sliding rail through sliding assemblies respectivelyand can reciprocate front a