The invention discloses a rotatable compressor and a pump body structure thereof. The pump body structure comprises a first assembly which is centered and cored, a first partition plate, and a second assembly which is centered, wherein the second assembly and the first partition plate are cored with the first assembly; the first assembly is provided with a coring threaded hole; the second assembly is provided with a second coring through hole and a third coring through hole which are opposite to the coring threaded hole, and a second centering through hole and a second centering threaded hole which are opposite to the coring threaded hole; the first partition plate is provided with a fourth coring through hole opposite to the coring threaded hole; {min(D22, D23, D24)-M21}-(D1B-M12) is greater than or equal to 0.2 mm and less than or equal to 1.0 mm, wherein D12 is the aperture of the second centering through hole, D22 is the aperture of the second coring through hole, D23 is the aperture of the third coring through hole, D24 is the aperture of the fourth coring through hole, M12 is the threaded diameter of the second centering threaded hole, and M21 is the threaded diameter of the coring threaded hole. According to the pump body structure, the assembling qualification rate and the assembling efficiency are improved.