The present invention provides a valve-type double-acting hydraulic impactor and method that can improve working performance, including a connecting section, a telescopic section, an
impact section, and an external shell; the connecting section is an
upper joint, which is used to connect with an upper
drill rod; a telescopic section is provided below the
upper joint, and the telescopic section includes an upper cylinder sleeve, a limit pad, a live valve, and a
piston hammer; the
impact section includes an anvil and a
drill bit
assembly, and the external shell includes an outer shell tube; the live valve is used to interact with a high-pressure driving liquid, reciprocate relative to the outer shell tube, drive the
piston hammer to periodically strike the anvil, and the
impact work received by the anvil is transmitted to the
drill bit
assembly connected thereto to impact and break the rock. The present invention includes a valve-type structure composed of a live valve that can both slide and isolate pressure and a
piston hammer, so that the live valve and the piston hammer have no rigid collision during the up and down
reciprocating motion, reduce useless
energy loss, reduce the additional load of the
drill bit, improve the
rock breaking energy and efficiency of the
drill bit, reduce the risk of parts being damaged by rigid collision, and improve the life of the impactor.