The invention relates to an excavator. In order to solve the problems that climbing is limited and the control operation is not convenient caused by that an upper part mechanism of a conventional excavator is oblique along with a lower part mechanism of the conventional excavator, the invention provides an excavator. The excavator comprises the lower part mechanism and the upper part mechanism, wherein the lower part mechanism comprises a middle framework, a left walking frame, a right walking frame and a pivoting support; the left walking frame is fixed to the left side of the middle framework, and the right walking frame is fixed to the right side of the middle framework; at least two rows of hydraulic oil cylinders are arranged at the top of the middle framework; each cylinder barrel of all the hydraulic oil cylinders are fixedly connected with the middle framework; the top of each hydraulic oil cylinder is hinged to a hinging seat; the hinging seat at the top of a piston rod of each of only one row of the hydraulic oil cylinders is a fixed hinging seat, and the hinging seat at the top of the piston rod of each of the other hydraulic oil cylinders is a movable hinging seat; the fixed hinging seats are fixedly connected with the pivoting support; and the movable hinging seats are in slip connection with a guiding device on the pivoting support. According to the excavator disclosed by the invention, the walking performance of the excavator in hillside fields is improved, so that the climbing capacity and the adaptability of the excavator are higher.