One-button controlled water spray gun

A one-button controlled water spray gun, having an outer casing, an inner pipe and a water pipe connected to the inner pipe being provided in the outer casing, a front end of the inner pipe having a spray pattern adjustment unit, a rear end of the inner pipe having a switching valve unit configured for switching the inner pipe to be in communication with the water pipe and a button unit configured for controlling operation of the switching valve unit, characterized in that:

• the button unit includes a first button and a second button that are arranged in a front-to-back configuration in a same axial direction, a first elastic member is provided between the first button and the switching valve unit, one end of the first elastic member is configured to push the first button for the first button to lean against the second button, a pusher is provided on an outer periphery of the first button, the pusher is opposite to and spaced apart from the second button, a second elastic member is provided between the pusher and the switching valve unit, one end of the second elastic member leans against the pusher, and another end of the second elastic member leans against a rear end of the switching valve unit;
• when the second button is pressed to move toward the pusher, the second button drives the first button to move forward and press against the first elastic member to generate a first pressing resistance;
• when the second button is pressed against the pusher to push the first button and the pusher to move toward the switching valve unit, the pusher is pressed against the second elastic member to additionally generate a second pressing resistance.