A seat for heavy equipment having a buffer means in forward and backward directions is provided, which can protect an operator by attenuating impact and vibration generated in a cab in forward and backward directions of an excavator in accordance with the driving of the buffer means in a main working mode of the excavator. The seat for heavy equipment is mounted on a suspension plate and is located between left and right console boxes.; The seat for heavy equipment includes a lower member mounted on the suspension plate; an upper member slidably mounted on the lower member in forward and backward directions of the equipment; a buffer means for attenuating impact and vibration generated in the forward and backward directions of the equipment; a tilting means including a frame, a hinge shaft, a driving shaft, and a control handle; and a locking means for locking and unlocking forward and backward movement of the upper member against the lower member when a pusher installed on one side of the frame is manipulated. In a main working mode of the equipment, a buffer function is performed through forward and backward movement of the upper member against the lower member, and when the main working mode is released, the buffer function is released.