The invention discloses a frequency stabilization and light intensity stabilization dual-piezoelectric ceramic tuning external cavity semiconductor laser. The laser comprises a laser diode module, a collimator, a light intensity stabilizing module, a blazed grating, an output reflector, an output polarization light splitting module, a two-dimensional adjusting module, a flexible adjusting platform, piezoelectric ceramic a, piezoelectric ceramic b, a frequency stabilizing module, a bottom plate, an elastic damper and a shell. The double piezoelectric ceramics are adopted to drive the flexible adjusting platform to achieve blazed grating rotation and translation, the length of the outer cavity can be adjusted when the angle of the grating is adjusted, a fixed longitudinal mode is kept in theouter cavity, and therefore broadband mode-hopping-free tuning is achieved. When atomic absorption spectrum characteristic analysis needs to be carried out, a frequency tuning mode can be adopted, and when a stable laser beam is needed, a light intensity stabilizing mode and a frequency stabilizing mode can be adopted; the output reflector and the blazed grating are placed on the flexible adjusting platform together, and the output light beam does not deflect in the tuning process.