The invention relates to novel powder high-temperature alloy and preparing method thereof. The novel powder high-temperature alloy comprises, by weight percent, 14.00 to 15.00% of Cr, 14.50 to 19.50%of Co, 4.5 to 5.5% of Mo, 3.25 to 4.10% of Ti, 2.50 to 3.10% of Al, 1.45 to 2.50% of Ta, 0.55 to 1.55% of Hf, 0.045 to 0.068% of Zr, 0.005 to 0.030% of C, 0.006 to 0.023% of B, 0.002 to 0.030% of P, 0.01 to 2.0% of Re, 0.1 to 2.0% of W, 0.1 to 1.0% of Nb, smaller than 0.5% of Y, smaller than 0.3% of V, smaller than 0.5% of Fe, smaller than 0.15% of Si, smaller than 0.12% of Mn, and the balance Ni.The gamma' phase content in the l powder high-temperature alloy is about 40 to 50%. The novel powder high-temperature alloy prepared through the preparing method has the good room temperature strength, high temperature strength and high temperature creep properties, and the use temperature is up to 750 DEG C.