A Schiff base compounds containing both rhodamine and coumarin L was synthesized by using Schiff base functional groups as linker, coumarin and rhodamine as chromogenic groups. The structure of the probe was characterized by 1HNMR, 13CNMR and HRMS. The recognition mechanism of Ca2+, Cd2+ and Al3+ were also investigated. The results show that L can selectively recognize Ca2+, Cd2+ and Al3+ in ethanol system and have some anti-interference ability over other metal ions. L and L+ions at pH 7～12 have significant fluorescence enhancement effect. High resolution mass spectrometry and the Job curve show that L can form complexes with Ca2+, Cd2+ and Al3+ in molar ratios of 1:1, 2:1 and 2:1, respectively.