Air suction device of plastic vacuum forming machine

The invention provides an air suction device of a plastic vacuum forming machine, and belongs to the technical field of mechanical equipment. The problem that an air suction device of an existing plastic vacuum forming machine is poor in stability due to the fact that an air suction pipe moves in two directions is solved. According to the air suction device of the plastic vacuum forming machine, the plastic vacuum forming machine comprises a machine frame and a guide rail arranged on the machine frame; the air suction device comprises an air suction pipe and a driving piece; the air suction device further comprises a sliding base arranged on the guide rail in a sliding mode; a guide hole and an air suction hole communicating with the guide hole are formed in the sliding base; the air suction pipe is arranged in the guide hole in a sliding and penetrating mode; the driving piece is arranged on the sliding seat and can drive the air suction pipe to stretch out and draw back; an air passing hole is formed in the