The invention relates to a ratchet wrench and discloses the ratchet wrench and a ratchet wrench head. The ratchet wrench comprises a ratchet base (1) and a ratchet (2). A through hole (11) used for installing the ratchet (2) is formed in the middle of the ratchet base (1); the front end and the rear end of the wall of the through hole (11) are separately provided with a front annular concave shoulder (111) and a rear annular concave shoulder (112); the bottom faces of the front annular concave shoulder (111) and the rear annular concave shoulder (112) separately form a front stepped face (131) and a rear stepped face (132); the outer surface of the ratchet (2) is provided with two snap ring grooves (22) which are internally provided with two snap rings (4); and the two snap rings (4) are separately located in the front annular concave shoulder (111) and the rear annular concave shoulder (112). According to the ratchet wrench and the ratchet wrench head, by adopting the two snap rings (4) and the stepped faces (131) matched with the two snap rings (4), limit to the ratchet (2) can be effectively achieved, an installation person can install the ratchet wrench head conveniently, and the assembly efficiency of the installation person is improved.