The invention provides a truss type bearing beam of a crane, and relates to bearing beam structures of the cranes. The truss type bearing beam of the crane is provided with a lower front cross beam rod, a lower rear cross beam rod, an upper front cross beam rod and a lower rear cross beam rod, wherein at least five upper and lower supporting rods are arranged below the lower front cross beam rod and the upper front cross beam, and at least five upper and lower supporting rods are arranged between the lower rear cross beam rod and the upper rear cross beam rod; the distance from a center part to the space between the upper and lower supporting rods at two ends gradually increases; a V-shaped inclined support is arranged between the center part of the upper front cross beam road and two endsof the lower front cross beam, and another V-shaped inclined support is arranged between the center part of the upper rear cross beam rod and two ends of the lower rear cross beam rod; an inclined beam supporting rod is arranged between the end part of each V-shaped inclined support and the adjacent cross beam rod; a front and rear connecting rod is arranged between the front cross beam rod and the rear cross beam rod. The truss type bearing beam of the crane has the advantages of being light in mass, convenient to produce and mount, low in material consumption, and low in cost.