A shock-absorbing shoe using a spring , the shock-absorbing shoe comprising: a spring configured to provide elastic force to absorb a shock; an outsole forming a sole of the shoe; an upper sole fixed to a top of the outsole and spaced apart from a heel of the outsole to provide a space for installation of the spring , the upper sole descending by a load or ascending by the elastic force of the spring ; a lower spring seat formed on a top surface of the outsole to support a lower end of the spring ; an upper spring seat formed on a bottom surface of the upper sole to support an upper end of the spring ; and an ascent/descent guider configured to rectilinearly guide an ascent/descent of the upper sole wherein the ascent/descent guider comprises: a guide shaft integrally protruding from the lower spring seat to be coaxially arranged with the spring ; a shaft holder formed in a hole shape in the upper spring seat to allow the guide shaft to be fitted thereinto, the shaft holder being configured to move in a longitudinal direction of the guide shaft to guide the ascent/descent of the upper sole ; and a shaft engagement portion formed on an upper portion of the guide shaft and having a larger outer diameter than the shaft holder , the shaft engagement portion being radially contractible and expandable to be engaged with the shaft holder so as not to be separated when fitted into the shaft holder . a spring configured to provide elastic force to absorb a shock; an outsole forming a sole of the shoe; an upper sole fixed to a top of the outsole and spaced apart from a heel of the outsole to provide a space for installation of the spring , the upper sole descending by a load or ascending by the elastic force of the spring ; a lower spring seat formed on a top surface of the outsole to support a lower end of the spring ; an upper spring seat formed on a bottom surface of the upper sole to support an upper end of the spring ; and an ascent/descent guider configured to rectilinearly guide an ascent/descent of the upper sole wherein the ascent/descent guider comprises: a guide shaft integrally protruding from the lower spring seat to be coaxially arranged with the spring ; a shaft holder formed in a hole shape in the upper spring seat to allow the guide shaft to be fitted thereinto, the shaft holder being configured to move in a longitudinal direction of the guide shaft to guide the ascent/descent of the upper sole ; and a shaft engagement portion formed on an upper portion of the guide shaft and having a larger outer diameter than the shaft holder , the shaft engagement portion being radially contractible and expandable to be engaged with the shaft holder so as not to be separated when fitted into the shaft holder . a guide shaft integrally protruding from the lower spring seat to be coaxially arranged with the spring ; a shaft holder formed in a hole shape in the upper spring seat to allow the guide shaft to be fitted thereinto, the shaft holder being configured to move in a longitudinal direction of the guide shaft to guide the ascent/descent of the upper sole ; and a shaft engagement portion formed on an upper portion of the guide shaft and having a larger outer diameter than the shaft holder , the shaft engagement portion being radially contractible and expandable to be engaged with the shaft holder so as not to be separated when fitted into the shaft holder . <EOS>