The utility model relates to a working table device for opening and closing a machine head of a press-and-blow machine. The working table device adopts the structure that a left swinging arm and a right swinging arm are sleeved on a left pivot and a right pivot respectively; the left pivot and the right pivot are connected on a fixed block respectively; one end of a left torsional spring and one end of a right torsional spring are connected on the fixed block; the other end of the left torsional spring and the other end of the right torsional spring are connected to the left swinging arm and the right swinging arm respectively and are arranged symmetrically; a right-side end surface and a left-side end surface at the upper part of the left swinging arm and a right-side end surface and a left-side end surface at the upper part of the right swinging arm are in contact with a left-side end surface and a right-side end surface of a locking block; the locking block is connected with the upper end of a pressure spring; the lower end of the pressure spring is in contact connection with the fixed block; the upper part of the locking block is aligned with a push rod; and the rear segment of the push rod is connected with a driving device. The utility model overcomes the defects of raw material consumption, low product quality and multiple procedures. The utility model cancels the necessary cutting procedure and the cleaning procedure in the prior art, lessens workload, saves raw material, reduces manufacturing cost, improves the condition and the quality of glassware, has the advantages of simple and reliable structure, feasibility, convenient operation and automation, and is favorable for industrial production on a large scale.