We report on the discovery of new four variable stars in the Cassiopea constellation from the archive of the HALZ telescope, operated by the TOPTEC team at Horni Halže, near Klasterec nad Ohři, Czech Republic. The stars are catalogued as UCAC4 718-108144 (23h 04m 16.383s +53° 29’ 44.78”), UCAC4 725-101725 (23h 09m 27.87s +54° 51’ 23.27”), UCAC4 725-101699 (23h 09m 19.53s +54° 57’ 57.18”), UCAC4 722-105015 (23h 10m 42.4s +54° 14’ 33.33”). From the light curve, the stars should be a HADS – type variable (UCAC4 718-108144), an EW – type variable (UCAC4 725-101725), an EA - type variable (UCAC4 725-101699) and an ELL – type variable (UCAC4 722-105015). We registered these stars in the CzeV catalogue as new variable stars CzeV709, CzeV710, CzeV711 and CzeV715.