Field experiments were carried to evaluate a single-row developed machine at El-qureen city, Sharkia Governorate, Egypt. A local peanut harvesting machine has been developed to perform total mechanical harvesting of onion. The planted onion crop variety was Beheri (red). The performance of the developed harvesting machine was conducted under the following parameters: different forward speeds of 1.7, 2.4, 3.1 and 3.8 km.h-1 and soil moisture contents (d.b.) of 9.4, 12.7, 15.8 and 18.8 %. The performance of the developed machine was evaluated taking into consideration field capacity and efficiency, total harvesting losses, lifting efficiency, machine productivity, required power, specific energy, operating and total costs. The experimental results revealed to operate the developed machine with high field capacity, efficiency and low specific energy and total cost, the proper forward speed and soil moisture content are 3.1km.h-1 and 15.8% (d.b.) at constant digging depth, pulling chain speed and penetration angle were 10.0 cm, 66.13 m.min-1 and 10°, respectively.