A reversible ratchet wrench without a switch knob, comprising a wrench body, the wrench body having a handle portion, one end of the handle portion being connected with a head portion, characterized by: the head portion having an accommodation trough and a detent trough communicating with the accommodation trough, the ratchet trough being provided with a blind hole in the direction of the handle portion; a ratchet wheel, disposed in the accommodation trough, an outer peripheral surface of the ratchet wheel being provided with a plurality of drive teeth, the ratchet wheel being displaceable in the accommodation trough toward the handle portion to form a first position and a second position, the ratchet wheel being normally located at the first position, wherein when the ratchet wheel is located at the second position, the ratchet wheel is displaced toward the handle portion; a detent, disposed in the detent trough, one side of the detent, facing the ratchet wheel, being provided with a toothed surface, the toothed surface being provided with a plurality of detent teeth, the detent teeth being configured to mesh with the drive teeth, another side of the detent being provided with a limit surface, left and right sides of the limit surface being formed with push portions, respectively; an elastic member, disposed in the blind hole, the elastic member being pressed against the limit surface, wherein when the ratchet wheel is at the first position, the elastic member is pressed against one of the push portions of the limit surface, wherein when the ratchet wheel is at the second position, the ratchet wheel drives the detent to compress the elastic element; wherein for a reverse switch, the ratchet wheel is displaced to the second position to compress the elastic member and then the ratchet wheel is turned to drive the detent to move toward the left or the right, so that the elastic member is pressed against the other push portion of the limit surface to complete the reverse switch. the head portion having an accommodation trough and a detent trough communicating with the accommodation trough, the ratchet trough being provided with a blind hole in the direction of the handle portion; a ratchet wheel, disposed in the accommodation trough, an outer peripheral surface of the ratchet wheel being provided with a plurality of drive teeth, the ratchet wheel being displaceable in the accommodation trough toward the handle portion to form a first position and a second position, the ratchet wheel being normally located at the first position, wherein when the ratchet wheel is located at the second position, the ratchet wheel is displaced toward the handle portion; a detent, disposed in the detent trough, one side of the detent, facing the ratchet wheel, being provided with a toothed surface, the toothed surface being provided with a plurality of detent teeth, the detent teeth being configured to mesh with the drive teeth, another side of the detent being provided with a limit surface, left and right sides of the limit surface being formed with push portions, respectively; an elastic member, disposed in the blind hole, the elastic member being pressed against the limit surface, wherein when the ratchet wheel is at the first position, the elastic member is pressed against one of the push portions of the limit surface, wherein when the ratchet wheel is at the second position, the ratchet wheel drives the detent to compress the elastic element; wherein for a reverse switch, the ratchet wheel is displaced to the second position to compress the elastic member and then the ratchet wheel is turned to drive the detent to move toward the left or the right, so that the elastic member is pressed against the other push portion of the limit surface to complete the reverse switch.