The utility model discloses a pressure-measurement corer for large particles with the diameter being 38mm. The corer comprises a ground instrument and a downhole instrument. The downhole instrument is provided with a main eccentering arm. The ground instrument is composed of a ground control box, a ground pressure regulator box and a ground transformer box. The downhole instrument is composed of an electronic module, a hydraulic module, a mechanical module and a balancing module. The ground instrument is connected with the downhole instrument through a collector ring, a cable and a cable head. The hydraulic module uses a DC motor as a power source. According to the pressure-measurement corer for the large particles with the diameter being 38mm, the DC motor is used as the power source to drive a motor provided with a drill pipe with the inner diameter being 38mm to rotate at a high speed so that stratified rock cores with the diameter being 38mm can be obtained. Smooth and economical speed regulation can be achieved through the DC motor, torque of the DC motor is large, and the DC motor is environmentally friendly, low in maintenance cost and capable of saving energy. As pressure measurement and coring are organically combined, the pressure of a target stratum is acquired while the large-particle rock cores are drilled; in this way, well logging efficiency can be enhanced, and well logging cost can be lowered. By the adoption of a quartz pressure sensor, the requirement for pressure measurement of strata with different permeability rates can be met, and the reliability for acquiring the pressure of the measured strata can be determined.