The invention discloses a panel crack detecting structure and detecting method. The panel crack detecting structure comprises a pixel driving circuit with a voltage drop compensating unit and a crackdetecting trace unit arranged on a panel. The crack detecting trace unit is connected to the pixel driving circuit through a first power voltage terminal. The signal control unit is used for generating a detection signal of panel crack detection to weaken or eliminate the compensation function of the voltage drop compensating unit. The voltage drop compensating unit is used for compensating the voltage drop inputted into the first power voltage terminal of the pixel driving circuit. The first power voltage terminal is used for providing an anode voltage for pixels. According to the panel crackdetecting structure and the detecting method, the panel crack detection can be effectively realized without using a switch, at the same time, the electrical detection of the panel is not affected, the efficiency and accuracy of the crack detection are improved, and the narrow frame design of the panel can be achieved at the same time.