The invention provides a dropping-and-fishing-free well-flushing pressure switch, which mainly solves the problem that crude oil in a well shaft enters an oil pipe. The dropping-and-fishing-free well-flushing pressure switch is characterized in that an upper joint (7), an upper main body (6), a middle main body (5), an outer tube (4), a lower main body (3) and a lower joint (2) are sequentially connected; the surface, corresponding to the upper main body (6), of the upper joint (7) is provided with a valve ball seat and a valve ball; a claw block frame (8) is fixed under the upper joint (7); three claw blocks (9) are connected onto the claw block frame (8); a torsional spring is arranged on a claw block shaft; a valve core (1) is axially arranged in the lower main body (3); a lower lug boss of the valve core (1) is matched with an inner lug boss of the lower main body (3); a pressure regulating sheet (10) is arranged in the outer tube (4) arranged at the lower end part of the middle main body (5); a mesh plate (11) sheaths a sealing lug boss of the valve core (1); a large spring is arranged between the mesh plate (11) and the pressure regulating sheet (10); and a small spring is arranged between the lug boss of the valve core (1) and a guide frame (12). The dropping-and-fishing-free well-flushing pressure switch has the advantage that the crude oil in the well shaft can be prevented from entering the oil pipe.