The invention discloses an engineering machinery frame suspension structure which comprises a suspension structure lower layer, a main damping chamber, damping spiral springs and interlayer damping cushions, wherein lower layer connecting bolts are mounted above the suspension structure lower layer; a suspension structure upper layer is arranged above the main damping chamber; a resonant block ismounted above upper layer connecting bolts; the damping spiral springs are connected on the resonant block; a support seat is mounted below the damping spiral springs; a sealing head is mounted belowthe support seat; the lower side of the sealing head communicates with resonant limiting blocks; the interlayer damping cushions are mounted below the resonant limiting blocks; a damping plate springis mounted below the interlayer damping cushions; an explosion-proof inner panel is mounted outside the damping plate spring; and a frame connector is mounted below the suspension structure lower layer. The suspension structure has a good damping effect and can effectively improve the damping performance of an engineering machinery frame so as to improve the carrying capacity of the engineering machinery.