The invention discloses a processing method of seabed in-situ test data and belongs to the oceanographic engineering geological exploration field. The processing method of the seabed in-situ test datacomprises the steps that a tip resistance correction factor is obtained through a laboratory experiment by means of ratio relevant calibrators; in the process of utilizing a seabed in-situ test device to penetrate into seabed sediment, pressure variation, dynamic penetration rate and dynamic penetration tip resistance are obtained; according to the pressure variation, earth pressure is obtained;according to the tip resistance correction factor, the dynamic penetration rate, static penetration rate, the dynamic penetration tip resistance, the earth pressure and probe coefficient, undrained shear strength is obtained, wherein the static penetration rate is a constant value, and the probe coefficient is a constant value. When the parameters of the penetration process are processed, the dynamic penetration rate is used as one of influence factors of the undrained shear strength, the influence of strain rate on the shear strength is taken into full consideration, so that the obtained undrained shear strength can better accord with actual working conditions, and the data result is more real and more reliable.