The utility model relates to a combined machine tool's frock clamp, especially a from supplementary strutting arrangement of locking -type pneumoelectric drive. Constitute by pneumatic supporting mechanism, spring locking mechanism and electronic release mechanism, support the work piece by the depression bar in the pneumatic supporting mechanism (8), pull rod among the spring locking mechanism (16) with support " keeping silent " that cover (17) constitutes and carry out elasticity locking to depression bar (8), the unblock is carried out to " keeping silent " in rethread eccentric wheel (14) to the auxiliary stay and spring locking and the electronic unblock function that realize. The utility model has the advantages that, the holding power is little and adjustable, and it is reliable and stable to support the position, does not change along with the elastic deformation of holding surface, and work piece processing precision is high, the elasticity locking force is stabilized adjustablely, the unblock action is realized in motor drive eccentric wheel (14), has replaced traditional hydraulic drive, realizes cleaner production. The complete machine device can realize also that the multiple spot supports.