The invention discloses a direct thrust fault-tolerant control method for a wave power generator. The method includes the following steps: (1) when a permanent magnet linear generator used for directdrive wave power generation normally operates, a machine-side rectifier circuit adopts a zero d-axis current control strategy to control the electromagnetic thrust of a generator by controlling q-axiscurrent, so that the output power of the generator can be controlled; and (2) when a single-phase open circuit is failed, a five-phase permanent magnet linear generator adopts the direct thrust fault-tolerant control method to convert residual non-fault phase current into [alpha][beta] and x coordinate systems so that i[alpha], i[beta] and i can be obtained; through a current model based fluxobserver, virtual stator flux in the [alpha][beta] coordinate system can be estimated; motor thrust is calculated, and motor thrust errors obtain a thrust increment angle through a PI controller; andthrough a voltage vector predictor, a motor open circuit can be ensured to have same stable state performance with normal operation after failure through a carrier pulse width modulation technology.