The invention discloses a formula and a technique for manufacturing a geophysical prospecting bit by powder sintering. The formula comprises the following raw materials: in the mixed tungsten carbide powder, 60 to 80 meshes of tungsten carbide powder is 30 percent to 40 percent, 80 to 200 meshes of the tungsten carbide powder is 60 percent to 70 percent, the proportion of the tungsten carbide powder, bonding alloy and dehydrated sodium tetraborate is 100:62.5:5 and the bonding alloy is copper-manganese-nickel alloy, and the proportion of the copper, manganese and nickel is 68:27:11; and the technique comprises the steps of die making, material mixing, preprocessing of steel body, filling, sintering and trimming. At present, the geophysical prospecting bit is mainly processed and manufactured mechanically, and the material and the structure of the bit is more single; and in order to adapt to the exploration of areas with complex formations, the invention adopts powdery materials which are easy to change the material of the bit and can manufacture the bit with complex structure by designing a mold. The formula has low cost, the performance of the finished product is reliable, the technique steps are optimized properly, the technique is simplified and the cost-performance ratio is high.