The invention provides a side-pumping solid-state laser. The solid-state laser comprises a pumping source and a laser working substance, the pumping source is used for providing pump light, the pump light is incident from the side face of the laser working substance to the inside to be absorbed, the pump light is transmitted along the two large faces of the laser working substance, and the pump light always satisfies a total reflection condition when transmitted in the laser working substance. The solid-state laser improves the absorption efficiency of the pump light, the design is flexible, and the manufacture difficulty is small.