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In order to solve the problem of poor seeding depth consistency of no-till corn planter under high-speed operation environment, an adjustable hydraulic profiling mechanism was designed, which realized high-precision synchronous profiling by means of compensation adjustment. The application of ANSYS software on the hydraulic profiling mechanism for static analysis was carried out, to find the initial extensions of the hydraulic cylinder and hydraulic profiling mechanism of the maximum stress-strain value of the relationship between the analysis results showed that, in the 30mm, 40mm, 50mm, 60mm and 70mm extensions, with the increase of the initial amount of the hydraulic cylinder installation, the hydraulic profiling mechanism of the maximum stress value of a significant reduction in the maximum strain value was gradually increased. In order to preliminarily test the operational performance of the hydraulic profiling mechanism and verify the enhancement effect of the designed sliding adjustment mechanism on its operational adaptability, a two-factor, five-level quadratic orthogonal rotary combination test was conducted by using the pitching seeding unit profiling performance testing bench with the initial extensions of hydraulic cylinders and the operational speed as the test factors, and the ratio of the upper and lower profiling average error, the profiling average error, and the average adjustment time as the test indexes. When the operating speed was 12.3km/h, the sliding adjustment mechanism had the best effect on the improvement of adjustment accuracy, and it can reduce the adjustment error by 18.99%;when the operating speed was 14.8km/h, the sliding adjustment mechanism had the best effect on the improvement of adjustment speed, and it can shorten the adjustment time by 16.11%;and by sliding adjustment mechanism, the average error of the mimicry under different operating speeds was not more than 2.02mm, and the average error of the mimicry at different operating speeds was not more than 0.29s, which met the design requirements. In addition, in order to further verify the comprehensive profiling performance of the hydraulic profiling mechanism, the field comparison test was conducted, and the results showed that the qualified rate of seeding depth of the seeding unit equipped with the hydraulic profiling mechanism was 94.8%, and the maximum coefficient of variation of seeding depth was 6.12%, and all the indexes met the requirements of agronomy for corn seeding.