The invention relates to a 3-3-1 type seven-mobility spatial hydraulic excavator which comprises a three-dimensional rotating arm mechanism, a three-dimensional rotating bucket rod mechanism and a one-dimensional rotating scraper bucket mechanism. The three-dimensional rotating arm mechanism comprises a three-dimensional rotating arm, a first hydraulic cylinder, a second hydraulic cylinder and a third hydraulic cylinder, the three-dimensional rotating bucket rod mechanism comprises a three-dimensional rotating bucket rod, a fourth hydraulic cylinder, a fifth hydraulic cylinder and a sixth hydraulic cylinder, and the one-dimensional rotating scraper bucket mechanism comprises a one-dimensional rotating scraper bucket, a seventh hydraulic cylinder, a first connecting rod and a second connecting rod. The moving arm and bucket rod of the novel excavator can realize independent spatial three-dimensional rotation respectively, the whole excavator can realize spatial seven-mobility motion, the mechanism output trajectory is flexible, the working space is large, the working efficiency is high, and the novel excavator can play a better role in construction sites with harsh environments andnarrow and small spaces, as well as sudden accident rescue scenes which need to be excavated, remove obstacles and be leveled fast.